It's developed by Petter and FX. FX was head on previous cars Petters excelled in, like the 2003 Subaru Impreza WRC. Perfect match it seems.

No one is downplaying anything. It's just a fact that Petters team seems to have an advantage over the others at the time, even though their team backing is less than Audi and Peugeot. Good work by PSRX.

As for dominance, sure, right now Petters cars are the ones to beat. Just like Audi had an edge the first three races this year. Or how Ford is the only team to have scored a perfect weekend (though Petters been there except for a P2 in Q4). Ford seemed pretty dominant then, so it varies.
I'm sure the others will catch up to Petter eventually.