I'm not super plugged in, but I haven't seen or heard anything to contradict the claim that traditional Marvel/DC superhero comics have seen declining sales (number of books sold, not $$) for a while now. Of course the overall picture for "comics" in general is different, especially, as noted above, if you are including manga.
I know a few people in the comics industry still, and a few who have quit, either totally, or gone indie.
Things are bad for Marvel and if it were not for the movies their rampant and often outright hateful woke agenda would have sunk them well before Covid. Marvels underhanded business practices have been pissing off and eventually repulsing vendors for a while now and their attempts to either force shops to buy, or create their own venue have damaged things even more.
For a while DC was reaping the benefit of Marvel's stupid. But they have been gradually infiltrated over the last year or so as well and like Marvel have gotten increasingly hateful in pushing their woke agenda. And sales are plummeting. Not as fast as Marvel. But its started.
IDW has been back and fourth for a good while now and you never know what they will do great, and what they will ruin with their on again/off again woke agenda.
And various RPG and gaming companies are doing exactly the same and several are only staying afloat due to momentum, near cult level fans, or swinging between woke and not such that some product fail but the rest succeeds. WOTC, Chaosium and FFG come to mind right off. And there are many others, some going full on woke cult and attacking others. Some more quiet about it.
The thing with WOTC is that in their product the agenda is not really present. The few things in books are nearly every time meaningless and have no impact or backing.
Staff on the other hand are a totally different matter and have gotten, of course, increasingly nasty towards people.