Sure! it won't fall from the top of the standings because previously it had a 5 point gap from Nice while Nice is not a threat to PSG whose performance is stronger and for me a draw is better.
I watched the match but it seemed like the PSG players, especially the defenders, were a bit tired so they lost concentration and were unable to block the Brest players so they conceded.
Mbappe, who is PSG's mainstay player, was unable to do anything because he received a yellow card so he couldn't perform optimally, rather than forcing himself to appear tough and causing disaster with a red card.
I consider this a surprise but the most important thing is that it does not affect PSG's position.
For now, PSG is still quite comfortable with being at the top of the standings because they have quite a large distance between points. So the draw clearly will not affect PSG's fight for the title in Ligue 1, but PSG's task this season is still not much different from the previous season, namely trying to perform optimally in the UCL. Because in Ligue1 PSG has proven to be strong and can continue to have the Ligue1 trophy as long as PSG is not so down.