I think he conclude it by analyzing the remaining matches.
I can agree that Liverpool has a higher chance to be the winner because they seem having easier matches.
But Arsenal and Man City look to have the same chance. They still have some big matches, including the match between them (Man City vs Arsenal).
But in football, we don't know what crazy things will happen. Arsenal is exploding at the end of the season. Meanwhile, Guardiola is still ambitious about winning the successive treble.
At the moment, despite the position in the standings, bookmakers estimate the chances for the title as follows:
City - 2.10
Liverpool - 2.90
Arsenal - 3.50
Quite an interesting feeling arises when I look at these quotes: they all seem profitable
A bet on Arsenal looks interesting since the odds compensate for the risk (and with a margin), a bet on Liverpool since the Liverpool title will not be anything unusual and the odds are high, a bet on City since it is +110% and during the season City quotes were at the level of 1.10.