There's no inconsistency between those two statements. If there's a fundamental issue leading to underachievement or underperformance and any organisation, not just a football club, feels that the manager is the problem, the best course of action is to sever the relationship and get someone new in, in order to freshen things up. Pep's earned time because of his achievements for us and for his previous clubs. I'm sure he'll see the next season out, then we'll see. If we struggle for top 4 next season then I think most would agree it will be time to look elsewhere. On the other hand, we may win the quadruple.
Let's also look at it another way. Let's assume Pep's says to the powers that be, "I'm definitely not staying beyond next season. But if you want a replacement then I'd recommend you appoint [insert name]." Let's speculate that the name is Pochettino. Now for all the idiots who don't bother to read things properly, I'll put it in capital letters. I'M NOT SAYING POCHETTINO IS A BETTER MANAGER THAN PEP. IT'S JUST AN ILLUSTRATION OF A POINT I'M TRYING TO MAKE. OK?
Pochettino is presumably available now, for next season, but might not be in 2021. So the board have to decide whether to approach him now, for him to take over next season and avoid the risk of losing out. So even if Pep is happy to see out his contract and we're happy for him to do so, it still might not be in our interest to let him do that depending on who his successor will be.