It's not rumors. It was shown on the "team Solberg" reality TV that follows him during the year.
It was after Finland 2021 that P.Solberg was banned from the team service area.

That said it was also shown on the same series how it was Adamo "giving" him the (almost) full 2022 factory seat (also in Finland). It was also Adamo (in his own words) who "snap" decided to put Solberg in WRC car for Arctic 2021.

So it definitely seems Adamo was pushing Solberg into the car (to "counter" Rovanpera).
Problem is that Rovanpera had a few seasons in R5 to really develop. All this rushing just slows/hinders Oliver and instead of taking a step back they just push on.