There are rumours that Guardiola wants to strengthen several positions and maybe it will not be superfluous, given that some players are not getting any younger and are hampered by frequent injuries, and those who remain in the ranks are getting tired. Now City will have a few easy games, this will give them time to rest a little and regain confidence in their abilities, before the important match with PSG in the Champions League and the match with Chelsea in the Premier League.
Pep should have done that last summer, that is where he made the mistake, i know he likes to work with a very small squad (in terms of number of players), that is fine, but it is also important to freshen things up in a team, sell a few players and bring in a few, Ferguson used to do it when he was manager of United.
When you freshen things up in this way, you keep the hunger of the team alive, the new players you will bring in would prolly have never won the EPL, so they would motivate the other players who just won 4 in a row. It is hard doing business in January, but if he can get a few signings over the line, then City should be able to secure 2nd or 3rd place at the end of the season.
I don't understand you. Why did you say that Pep Guardiola made a mistake by not signing any player last summer? Have you forgotten that that same Guardiola won the Premier League without signing any player in the summer windows before? It's just unfortunate that things turned out like that for Pep and his boys but I’m sure he will be actively involved in this ongoing transfer window to be able to buy players.