I believe Pep Guardiola knows how difficult it was for his team to have gotten the record of winning the league 4 consecutive times that's why he could make such utterance, EPL is one of the most difficult league in the world but Pep Guardiola set the record together with his boys, right now I still don't see any team who can repeat what Manchester City has done that is the more reason Pep Guardiola needs to be given more time to bring back the performance of his team and to lead them to winning more trophies. Manchester City can bounce back next season but they need to change their strategy and bring in more players to challenge for the league next season.
There is this normal saying about people with privileges that doesn't know they are privilege, when they are privilege to the point they have everything they have always dream, advise becomes normal to them and they say things without thinking twice because the position they are gave them large room to say what they want to say, that's what Guardiola is doing, he had so much good players on his table and he forgot, everything has time.
He is saying all that with confidence like he wasn't the one that managed this same players to victory, today the same players can't even confidently stay at the top of the table and he things they are all that. If not that some teams aren't in their place, last two season of Arsenal, with such performance they can repeat what he has done, but they are not there again. In fact almost all the teams are just managing, only Liverpool is putting some efforts.