The non-corporate speak translation would be “I tried my best to make this company bigger and more valuable, but it didn’t work. Some of you will now need to be sacrificed, but not me!”
Full responsibility is a samurai killing himself painfully while his best friend cuts off his head to end his suffering. That's full responsibility.
This is, "I fucked up guys, here's 3-6 months pay and some benes... my bad. And yeah I know I fucked up last year too, but I took full responsibility then as well, so it's all good..."
Better yet, refuse to take a bonus, not that the board should award one. If the board awards one anyway, contribute 100% of it to helping laid off employees.
And... I suspect whatever he's doing is also affecting him emotionally/mentally, and... to some extent career-wise. Taking these sorts of public steps may make it harder to be entrusted to CEO someplace else in future. Given patreon specifically, I doubt he's planning to leave and go CEO someplace else, but overall, there's no easy outs in scenarios like this. He'll be getting second-guessed and pilloried regardless of what steps he takes.