It still remains to be seen what Pep will say in two years from now. I don't what he will do when he has built this project and perhaps the best team in the world and it is still winning titles, will he then decide to leave the club for sure? He has some very strict ideas in mind and he has shown that he sticks to them although he also once said that he will leave Manchester City after a couple of years. If Haaland is at his best in two years from now and they can also get some other world stars who knows if Guardiola reconsiders his decision from today? If he sees the potential for another successful year he might extend the contract for another year. But for now it matters that they defend the titles they won.
I highly doubt that he would stay, he is not one to stay at the same club for too long after getting all he wants. He got what he want out of City, took him a bit longer than he expected but he got it.
Next up, in 2 years he will try to find a team that will be "almost" ready, he is the type of manager that takes a team that is almost ready to win the league and UCL together, and he makes them win it, we do not see him take a relegation zone team to higher level because why would he, he deserves better, he is a great manager so he will manage great teams, but not City or Madrid, those are already great so he wants to take something like PSG for example, a team with money and potential, and make them win the UCL, that's what he likes doing.