I just read another post from u about Lorraine and the Renees ("Province was united with Lorraine in the period we are talking about here, until it was absorbed by France in 1480. By the way, Gen, that list I sent you for Lorraine should probably be revised a bit; although technically Rene gave up the rulership of Lorraine to his sons, he was in reality the de facto ruler there until his death on 10 July 1480. He was still Count of Anjou. Maine, and Provence, as well as titular king of Naples while his sons were legally in charge of Lorriane, but Rene spent most of his time in Nancy and ruled the duchy with his sons as figureheads. So go from Rene I straight to Rene II."). I believe Max was in a somewhat similar position. In 1492 Max still de facto ruled the Netherlands (an under age son isn't actually reigning). I've also read quite a few times that even after Filips took over (because Max wanted it anyway) Max still had joint powers. He handed over control in 1493/4, so he had control in 1492, to Filips but he reserved the right of joint rule. After all in 1493 he was head of the house of Habsburg. Max letting Filips take over and also being the man who got the Netherlands in Habsburg hands in the first place and on top of that being someone who was quite active in Netherlands policies (seeing they rebelled against him

) and defending it against France shows it very much not was an independent country as u wanna make it out to be. Not saying it's not a special relation (then again that was the case for a lot of countries) but vassalage just is way too weak to portray the relation. In 1448 technically Burgundy was a vassal of the French King but were they really ? No. Karl V at one point was a vassal of the French King thru Flanders but was he really ? The vassal relation ship in the game hardly is well suited to every historical possibility.
Say if Filips had outlived his father as sons tend to do usually ? And that the marriages with the Spanish dynasty hadn't taken such a weird turn. We'd see a Habsburg complex without Spain. The game doesn't portray dynasties very well but Austria is the Austrian Habsburg dynasty and the Netherlands and all other possessions in the HRE were united under that one dynasty.
Frederik III still wasn't dead in 1493 either. Up till that point Maximilian really enjoyed himself in the Netherlands. Maximilan wasn't even HRE when the game starts. Actual control was Austrian Habsburg. Those white dudes on the map of the game

I changed the text.csv from Austria to Habsburg Empire anyway.
U also posted a list of Habsburg governors for the Netherlands, those also show that already by 1492 Habsburg control was nicely in place in the Netherlands.
Mary wedded Max to get the Netherlands under Habsburg control and from the moment they married they did as any offspring would be another Habsburg. A vassalage leaves open the option for independence, united independence even (and it happens as I tried it

) which just is wrong. The Netherlands weren't striving for indepence, let alone go for it united. Even if u go that way, which u shouldn't, u have to have a tag for every provicne as nothing bar the Habsburgs bound those territories together. An independence movement shouldn't be there anyway as no one contested the rightful rule of the Habsburgs in the Netherlands. The fact alone that the Netherlands as a unit can become independent is bad enough to not pursue this option as it just would not happen.
Another thing in the game is that if u really wanna go all dynastical u have to split up nearly every major country (Poland, Spain, France, ... )and I don't see that happening. If u only do that for the Netherlands and Austria (which wouldn't be very consistent) u at least have to do it too for Spain (it's not like it was a united country ruled by one person in 1492). On the other hand there are also countries in the game ruled by the same person but who still are separate.
The tag is HAB not AUS, it's the Habsburg realm. The territories that belong to the House of Habsburg. The Netherlands were part of that. Maximilian I was the head of the House of Habsburg (seeing Fred III isn't in the game) and was firmly in control of it.