Yeah, sorry, that was meant to say 'after Bruno signed' - it was a bit of a brainfart. Extrapolating that post-Bruno form over a whole season would be 87 points; it would indeed be quite unreasonable to expect that from the current side with the current schedule. But that run still informs my expectations: we're capable of such form and that's partly why I think that, as you say, 75-80 points is a very reasonable aim for a full season and why something like 70 points would be a disappointment even if it's technically an improvement over the whole of last season.We played 9 games post-lockdown, going 6-3-0. However, during that run we had a relatively easy schedule, where the best team we faced was Tottenham. I don't think you could realistically expect the team to reproduce quite that over a whole season, or for that matter the weirdly exceptional record we had against top teams last season, before as well as after Bruno arrived.
But I agree with your general point that ~75 points is a reasonable expectation, and 75-80 a reasonable aim. When pundits and others speak of us doing better than expected, that only makes sense in terms of table position, which certainly is better than expected. But that's due to the relative failure of others, not overperformance from us.