Because there's a lot of uncertainty at the moment that depends on the result of the FAA environmental review. If there's a "yes", then launch is likely this year. If there's a "no", then launch is likely not this year.

Aren't environmental review services a thing in the USA? It's pretty commonly expected to seek such services and edhere to their recommendations prior to filling a launch request in many jurisdictions around the world since prior to launch you have to coordinate with several state authorities, and do some paperwork.

I'm pretty sure any organization that's able to figure out such launch vehicle will be able to do their own due diligence.

It's already booked, but timeframe still unclear. We'll see when the first cargo missions succeed.

https://en.wikipedia.org/wiki/Polaris_program

That's a separate topic. The test flights still need to happen first.