No. His last major film, from 2019, had the second-highest opening weekend of any horror film in history. His work might not be relevant to you (it's not especially relevant to me), but we're back in motivated unreality when we start talking about him being culturally irrelevant, or that "nobody knows he's still alive".
Yes. It's a movie from 2019. Stephen King appears in it. I agree: his cultural impact in American is significant enough that books he wrote nearly 40 years ago are the bases for moves that set opening records today. It's pretty nuts!
Twitter needs LeBron James and Taylor Swift and the latest Kpop stars.
It has a sort of symbiotic relationship with world leaders and journalists.
But it does not really need people like James Woods and Kevin Sorbo (to pick two from the other end of the political spectrum). Same goes for 90s grunge bands or 80s hair bands. I fully expect those guys to pay to try to stay relevant. And I would put famous authors from the 70s and 80s in the same category.