I think the "this week" thing was a meme from the fact the youtubers went last weekned.
I am still on hopium that it will be this month due to Ludis comments in his deleted video about "having lots of eu5 content in the channel in a month". But we'll see.
Playing devils advocate (as im in the hopium train), the visit from the YouTubers could have been a first meet up to show them the studio and maybe even the game, and especially as a first meeting to organize a future event. Like videos, announcement, post announcement stuff. But that does not mean it would be imminent. They might have formed a work group to start working on announcement and post announcement several months ahead of it.