It's very unrealistic. Pep's worst point tally at City was 78 pts back in 16/17 season. 78 pts will be enough for top 4 this season, and virtually any other PL season. Even when we had to play with Ferna and Ota at CB in 19/20 we won 81 pts and had the best GD in the league.
The thing is Pep's teams are among the best league teams of all time. Pep's football is perfect for league seasons. If we don't suffer bad injuries to the likes of Rodri and Haaland, we'll win between 86 and 93 pts, imo, most probably between 88 and 90 pts. My guess is that the second best team will win between 80 and 84 pts. 70 pts are likely to be enough for top 4, the top teams will drop a lot of points, especially those in the CL.