About being predictable I can say many teams are unpredictable and they have unstable performances and PSG is one of them but the average of their performance was good enough to be on top of the table in the French league as the first team, PSG lost many points because of the bad performance we from this team before, the match between Lyon and PSG was one example for performance in PSG, but against Lens, they have to win the game.
At this time Lens is right below PSG in the standings while second in Ligue1 and yes PSG must be able to win the game this weekend so that the gap in points can continue to be created even though PSG can still be at the top of the standings if they lose this weekend's game. However, PSG must be able to try to win at home in this match besides having to get full points in the match because Lens is not far behind PSG in the standings.
PSG will still make a scheme that seems to be the same as the previous match with an emphasis on Mbappe and Messi. This can clearly be a reference for Lens about what strategy they should do.
However now it wouldn't be wrong to play an open game with PSG even if it was certain for possession Lens lost but making the most of the quick counter-attacks and long balls that Lens always does is still possible for a repeat of their first meeting.