I think this is the usual Twitter nonsense. No chance any random person on X knows the King's plans.
Royal titles are not linked to being 'working' or resident because that would undermine the whole concept of royalty, which is that you get your status purely through an accident of birth.
In any case I don't think 'the titles' matter nearly as much as some think. What matters is access to royal life, something Harry and his wife do not have anymore.