Not only now the PSG be favorite to win Ligue 1 even before the league starts, they have become a strong candidate to become champions this season, so I think there is nothing surprising about their current statistics including consecutive wins at the start of the season, PSG has a squad that is very capable and they are still better than the current rival teams, the quality of the squad and also the financial differences have been a strength for PSG to be able their to easily win Ligue 1, but unfortunately the greatness that PSG have in Ligue 1 is not comparable to their performance and mentality in the Champions League which very bad so far, to be honest if we talk about Ligue 1 of course we can't deny that they are the strongest candidate to be champhionsip, while other teams are currently only competing for a place in the UCL, but for this season Champions League, I personally don't expect much from PSG.
I also agree with what you said because I also do not consider it a surprise or an extraordinary achievement if PSG can still win this season in Ligue 1 because it has been predicted since the beginning before this season started. And of course it has a logical reason from some of the facts you said where PSG is still far superior in squad with its rivals and also financially with other teams in Ligue 1 so they can easily bring in the players they want. But for its achievements in the Champions League it is clearly still not proven because PSG is a tough team that has not yet felt the Champions League trophy until now.