I think Real Sociedad this season is not that strong, unlike last season so this is a little advantageous for PSG and the percentage of PSG being able to beat Real Sociedad is very large in the round of 16.
However, if we look at PSG's performance this season, I think it is appropriate that many parties doubt that they will win the title because we can reflect on what happened in Ligeu 1 which meant that PSG's performance did not improve significantly and that was a bit detrimental for the team.
The PSG team was built in the wrong way, they think money is everything and it has been proven that even though PSG brought in many star players, they were unable to make achievements on the UCL stage.
Well, if we refer to the depth of the two teams, it is clear that PSG is one level above Real Sociedad. although, currently only Mbappe is a big star in Luis Enrique's squad. but technically, PSG should be stronger than Sociedad. Likewise, when they meet in the last 16 match, Paris Saint-Germain has a greater probability of winning the match than Real Sociedad. at least, in the first leg PSG had the advantage of being the home team. so far PSG have only lost once when playing at the Parc des Princess, their home ground. even then, the defeat when they hosted Nice.
In the Champions League PSG's performance was not that good. however, now their game is starting to find its rhythm. at the very least, PSG will be able to beat Real Sociedad in the first leg. Likewise, if we refer to betting exchanges, bookies are favoring PSG for the time being. yeah, there is quite a visible gap between the two teams that will meet in the last 16. related to what you said, I think Enrique is well aware that his team doesn't have much chance of winning the Champions League trophy this season. remember, the PSG squad is mostly dominated by young squads. Plus, the main front line players still need a lot of experience so that they become more established. so, let's just wait for the round of 16 to be held again.