The reason is quite clear because Strasbourg this season and last season are very different and Lens is the same. They are like 2 clubs with a real difference in conditions at the moment. Last season in the 2 meetings that took place Strasbourg might indeed be very favored but for now with the condition of their performance and the current weakness of their defense I think this head to head has no impact whatsoever for Lens who is currently in high confidence.
Indeed, in this match Lens is very favored, I also have the same belief that Lens will win against Strasbourg. But on the other hand, let's forget about the second H2H for a moment, Strasbourg also doesn't want to lose because they are currently in the relegation zone and don't want to go down to ligue 2.
It's true, this match must be won by Lens, at least I also want to see competition between clubs this season, so it's not just monotonous being dominated by just one club. The 4 point distance seems to be a solid competition for PSG and Lens this season. It seems that the UCL zone will be secured for Lens for the next season and of course I am really looking forward to this competition like other regular leagues such as Arsenal and Man City or Barcelona and Real Madrid which currently have the same points or are only a few points away.