The statistics looks wasted indeed because from 27 total of shoots none of that even became a goal but i have been watching the match in the first half and Chelsea have put in a lot of efforts to scores but i don't know why seems Aston Villa can predict it and anticipated Chelsea attacking strategy and Chelsea actually gets good opportunities by Mykhailo Mudryk but unfortunately he cannot utilized that opportunity but do not forget about Martinez performance too because in my opinion he was performing well to guarded Aston Villa defense
However Aston Villa were playing very effective that they didn't need many touches of the ball to put Chelsea defense at risk and they just needed a quick counterattack to scores goals and defeated Chelsea and after this lost Chelsea position are down to 11th and apparently they have to forget to play at european competitions for next season
From what I can see 50% of the 27 shots are weak shots or low accuracy so it means nothing to the defense and the goalkeeper
While Aston Vila does rely on counterattacks with high accuracy I still remember how they scored the 2nd goal
Chelsea have conceded 4 goals in 2 matches which means the defense is very weak.