Those 97 and 99 point finishes are the outliers, not par for the course. So it's unlikely that we'll hit "those heights" again, yeah. But unless City improve again (and they probably will), 90 points won't necessarily be needed to win the title. Klopp will probably once again feck off the Carabao Cup, and I think we won't get far in the FA Cup either as usual. A title challenge and deep CL run would be the expectation for us.
I think people put far too much emphasis on our "demise" after the restart, or even after January if you go back a bit further. We had the title all but won after Christmas, you can't expect a team to keep up such a ridiculous form over an entire season. I think (or hope, at least) that we'll start the season a bit more re-energized - Minamino and Keita also look poised to have a greater impact this upcoming season which means our main guys get a bit more rest than usual.