I'm not sure Wrexham are reliant on overseas fans and sponsorships - but they have both, which has to be a bonus.
I'd agree that sponsoring a stadium where your product isn't available is an odd move on the face of it, but perhaps the company is seeking to expand its operations and it believes a sponsorship deal with a high-profile club like Wrexham are at present is a good investment - especially as the deal is likely to be reasonably cheap at this stage of Wrexham's development.
I can't think of any other examples of American film or media stars buying lowly football clubs and giving them the sort of profile Wrexham are currently enjoying, so I don't think it's possible to make any firm predictions as regards what the future holds for the club.