The guy is a bonehead.
He's calling City unstoppable like Bayern 2013 after the group stage and the Rof16. Teams gain and lose form throughout the season. This is why peaking too early is a problem. Real Madrid for example, and us too, are examples of teams that have learned to peak later in the season when it matters. One doesn't have to take top form right from September onwards, especially in CL.
As well, that Bayern team in 2013 looked anything but unstoppable before the QF matchup against us. They lost 3-1 to BATE Borisov on 2nd match day in the groups, and got spanked 2-0 by Arsenal at the Allianz, only progressing on the away goals rule. They only started looking unstoppable in the QFs against us and after that. They peaked at the right part of the year. March onwards.
City has proven nothing yet, played in an easy group, got the easiest Rof16 tie (still managed to lose at home against Basel), and until they beat a "good team" anyone predicting they are Bayern 2013 is just spouting nonsense.
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Napoli is, yes. But I would say they had their minds on other things, seeing as they crashed out of the group stage with losses to Shaktar and Feyenoord as well.