I don't think FRAP is going anywhere. I have been hearing rumors of that plant closing for 20 years. I think management puts those rumors out there like they are doing with OAP now.
Per the 2019 Contract:
"Job Security: A moratorium on outsourcing. A moratorium on any plant closures except for Romeo Engine. In the case of Romeo all jobs to be protected and transferred to nearby Van Dyke Transmission. An assistance package for retirement-eligible Romeo employees. A commitment to a Flat Rock viability strategy for new product. A commitment to Buffalo Stamping and securing future opportunities to the plant".
"Flat Rock Assembly Plant $250 million investment • All new Mustang, including derivatives • Lincoln Continental will continue through its product lifecycle"
"Flat Rock Assembly (FRAP) Viability Strategy Your negotiators secured language to jointly continue the viability of Flat Rock Assembly Plant. The Company has reaffirmed their commitment to FRAP, including making significant investments in the Mustang program and continuing to explore future opportunities during the life of this agreement. Admin. Letter 26U"
If anything, I see FRAP being to Ford like Bowing Green is to Corvette. I do not think the Mustang will ever leave SE Michigan, let alone the country.