So you agree that fusion power generation is not at the state where it can be straightforwardly built today, and you also have no idea what it might actually take to even research it to possibly get it there, but yet you're still asserting that "accelerating the burning" will surely cause whatever needs to happen to happen? Have I got that right?

Yes, pretty much, except getting to working fusion is not guaranteed - but the climate disaster is, so we have to make a bet. Solar and batteries are the obvious fallback plan. Nuclear should also be, but it’s a hard sell.