I know that Paris Saint-Germain lost to Liverpool when Liverpool visited them at home, but the most important thing is that Paris Saint-Germain was the team that advanced to the quarterfinals of the UEFA Champions League competition. Liverpool is very used to playing against Premier League clubs, and since they are dominating the Premier League this season, it will be difficult for Premier League clubs to travel to Anfield and dominate Liverpool the way Paris Saint-Germain did, but Nottingham Forest traveled to Anfield, and they beat Liverpool this season. Paris Saint-Germain was better than Liverpool when they played against each other, and that put Paris Saint-Germain in a position to pull out that amazing performance against Liverpool.
Yes, when Liverpool was visiting their home ground, Paris Saint -Germain was defeated against Liverpool. In fact, it was through that match that Paris Saint -Germain had been able to form a very balanced team. Moreover, as you mentioned that Liverpool is very accustomed to playing with the Premier League clubs, it may not be perfect because in my opinion Liverpool are accustomed to playing with the Champions League clubs. Before being defeated in Round 16, Liverpool Football Club was doing well in the Champions League, even if I was not wrong, they might have been at the top of the standing.