For me, the hard problem is such an obvious and almost intractable thing that any folks who dismiss it clearly don’t understand it (or live an inner experience that lets them understand it).
And because I’ve never really seen anyone flip on their view of the hard problem, I’m 99% convinced it’s because they actually have a different lived conscious experience. Perhaps they process information different, or have more or less access to their internal state.
It’s possible that folks who dismiss the hard problem actually have more conscious access to their internal state and hence don’t understand why it’s an issue.
An analogy is aphantasia (folks who don’t have an internal visual experience). Somebody with an aphantasic brain simply doesn’t experience consciously like others. I feel that understanding that the hard problem exists is something rooted in a different internal experience.
As for how illusions occur and from what things, it does hardly seem possible. But the alternatives are hardly better.
The illusionism argument is ridiculous because an illusion is still experienced (the very fact we are talking about it is proof), so at best it is circular reasoning. Probably it's woo-enough to be taken seriously by some :)
We have many explanations for what people describe as "the hard problem". But nobody who believes in "the hard problem" accepts these explanations, which have been given for decades by philosophers like Dennett.
There is no way to reconcile your view, that there IS a hard problem and that no progress has been made toward solving it, with our view, that there is no such problem, and that it does not need solving.