I think her website and her OnlyFans are two different worlds, and keeping them separate is probably strategic. Her website membership is comprised of people who think she's 10 years younger based off her latest uploads there. It would be quite jarring to her members to present the OF there and ruin the facade that the backlog creates. Starting an OnlyFans, which encourages recency and subscriber-tailored content, is a way for her to have a relatively fresh start with her real age without jarring her website membership.
But that's just my assumption. I don't actually know.