PSG had a really poor game and they were nearly losing as well. Mbappe and Barcola were really ineffective in the attacking line. Goncalo Ramos was the right move for the team as he scored the equalizer in the stoppage time. But is this 1-1 result a problem for PSG? Of course not. Because the gap Brest is still 9 points and I don't expect any team to get too close to PSG from now on.
Mbappe would get another Ligue 1 title before leaving but I wouldn't expect him to be champion in the Champions League this season. PSG aren't that good now. They can't eliminate Manchester City and Real Madrid with their current performance level.
PSG getting this draw is actually quite sad because they should have won but in the end it was still good thing because PSG didn't lose to Rennes.
No one could have thought that Goncalo Ramos would be able to score goal in added time at the end of the match which resulted in draw, if there were no goals then it would be clear that PSG would lose and I saw this match and I already felt that PSG would lose.
Mbappe, as the player most relied on for scoring goals, also couldn't play as well as in other matches, they got various opportunities but couldn't produce good results to score goal.
Even so, they are still at the top of the standings with complete comfort because with large margin it will be difficult to surpass them.
Yes, he will be guaranteed to get the Ligue 1 title before leaving PSG, and for the UCL he will never be able to get it with PSG.
In the future, PSG will face Monaco and this is much better team than Rennes so we could see the same result, namely draw, this is just prediction and we will not know how PSG will face Monaco later.