Haskell Foundation spoke to them very early on and continuously throughout the process. They decided not invest in any way, financially or with in-kind support.
FP Complete appears to be downplaying "Functional Programming" and "Haskell", perhaps because they found it scares off customers. At the same time, they are drowning themselves in generic buzzwords.
Haskell is below Rust on their website, despite being later alphabetically. I suspect they are pivoting away from Haskell toward Rust.
It creates some kind of partition, but it's not very relevant. Anyway, it's not very surprising that they don't want to sit on the same committee.
Anyway, its not a big deal. I even doubt they will have more or less influence over anything because of that decision. It's not like unofficial communication will stop.
The rest of the community isn't as homogeneous and aligned as one might think either.