I agree with you. If given the choice and Enrique has to rotate his players I think he will prioritize the UCL competition over other competitions. For PSG I think they no longer consider the League title as one of their targets because they can almost get it easily every season. Currently they are in high confidence because they managed to beat Liverpool who have a fantastic record this season. Although PSG did not dominate Liverpool by scoring many goals but this shows they have a solid defense and a champion mentality.
Currently, the League is on holiday. So I think a lot of players are with their country. Maybe the international break will run for at least 2 weeks, there may be a risk of injury due to fatigue. So the rotation may be good, but keeping the league position comfortable is a priority as well. So I think giving them less minutes will help them avoid injury.
I think the League and the UCL are just as important for PSG. They want to make a record of 2 cups this year. The league will start on March 30, while the UCL will be in April. So there is still plenty of time to prepare well. Maybe in theory Aston Villa is also a debutant, but PSG should not underestimate them. I think it's going to be difficult.