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When Chelsea played against Luton and won, the fans of the club were happy that Chelsea were showing signs of improvement, and signs to do better this season, but now they have played a stronger and more threatening team, and we have seen that they have not really improved from last season. Chelsea still lack the ability to recover from games from behind once they are scored. Pochetino has no excuse as to why Chelsea lost because he has very good players at his disposal. In a few more games, If Chelsea continue with this unimpressive performance, many Chelsea fans may start demanding that he be sacked and replaced.
In fact, Chelsea was able to dominate the match compared to Nottingham, but Chelsea had difficulty breaking into Nottingham's goal. Lack of player creativity is the first reason, but a lack of consistent strategy is also a reason. I didn't find Nottingham playing well except being really good defensively which combined with taking chances, it won them the game even though it was completely unexpected.
The bottom team uses a defensive strategy to win points against the top team. The weakness of Pochettino's strategy is that he was able to find a solution to find the net even though they had a lot of shots in total. Poor finishing is also an excuse, but of course Pochettino is under pressure at the moment.