That was... very poor phrasing on my part, and the criticism it's caused is completely justified.
The question as posed in the Q&A suggests that increased difficulty is an easy fix that we're just choosing not to do. What I was trying to say is that it's not that straightforward; it's hard to make content that's challenging for veteran players without wiping new players out, but that doesn't mean we're not trying. We just want difficulty that's fun to engage with, and not frustrating.
We want to make the player lose in ways that encourages them to adapt their strategy and try again, rather than sit there looking at a game over screen feeling like the game screwed them over with mechanics that were incomprehensible or completely out of their control. There's already a variety of ways to crank the difficulty up by artificially boosting the AI or hobbling the player themselves via game rules, but given that the discussion around difficulty persists I think it's safe to say that even the veteran players feel that's not an acceptable solution to the problem. And to be clear, I do consider it a problem.