I don't believe a word coming out of any Meta spokesperson's mouth.
It'd be more believable had they said that 19% of the Chinese revenue was NOT coming from ads for scams, illegal gambling, pornography and other banned content.
But then, it may be better than it was when I last used it...in 2018...and that was simply to log in specifically to delete my account, after I started to receive almost weekly 'reminders' that I "seem to be having trouble logging in" as I hadn't be online for months, and "may have forgotten my password, so here's a PIN to log in again".