Or, you know, teams just drop points over a 38 game season. Nobody is winning every single game and there are always circumstances around these games. Liverpool, regardless of whether they were dominant or not, definitely had some good fortune in the first half of the season (just like City got last season). If City can drop points so can Liverpool; that doesn't make them chokers it just means they're not perfect. City have better depth and more importantly are a better team at consistently beating smaller sides which is very important in a title race. They also won the head to head with Liverpool which when neither team is dropping that many points to mid/bottom table is a big deal.
Teams can be very good, not win a title, and still not be chokers. I especially find the Christmas break statistic amusing given how much of the season is left to be played. Does anyone really expect City to drop many points along the way? No, but Liverpool have to be perfect to close out the season or they're chokers? Seems reasonable.