You are missing the important point where I said they also have a game in hand. I would rather call it a 2 point gap at this point since they're almost at full strength and that's not a lot to catch up to. Just one unexpected loss from Liverpool and we may see a change in leaderboard.
I think it's still a bit hard since Liverpool are in advantage and I agree with what you are saying but what if City also loses some points in attempt to cover the gap? It will be all same again. The pressure is too huge for the top teams in the PL table right now. The one who is consistent will be the one winning the season. Liverpool no doubt have maintained better consistency and I feel if they continue to perform like this, then they will for sure will win the title this season.