If the NFL received a request to franchise a foreign team and rejected it, they would state why, per their own rules, they rejected it. That is what the letter demands.
Understand?
So, to go back in time…
The FIA spent months of due diligence on the Andretti Global business plan and resources. They pronounced them good to go.
The teams and Liberty made Andretti jump through hoops, and rejected them giving no good reason.