Sounds like it has indeed landed on Grand Ave but I don’t think it impacts Star Tours. While MuppetVision has excellent GSATs, the rest of the impacted area is underutilized (shuttered shops, PizzeRizzo, Melrose’s) and already looks like a city. They can easily build the new coaster here and reopen the shops (with monster merch that will sell) and have an on-theme QSR, TSR and M&Gs open.
I also think they may be planning to announce, now that HoP must be updated anyway, that the Muppets will move from DHS to MK to lessen the blow there, but that’s just my personal thoughts on why they haven’t announced MuppetVision’s closure.