I can’t imagine they’d be able to use AI to recreate the performance / voice of any of the union actors, without their or the unions sole permission.
If they asked any of the actors to film new content for this, or lend their voices, it would likely be a union set still, or the union itself would have to give a special exemption for the talent to work on a non-union project, which may be unlikely.
Of course maybe theme parks get an exemption? But I’d assume it would be a union set if they were to use the big names.