I was honestly not surprised seeing Chelsea beat westham with that number of goals in that match, and this is because before the game began, I had expected Chelsea to win the game by two or three goals, but fortunate enough for them, they added extra two goals which really is commendable, but it's also important we know that westham isn't a team that is in the same level with Chelsea, Chelsea is way higher and better in terms of performance.
And speaking of whether or not Chelsea will not lose any game all through this season, I would say it's unlikely, Chelsea will definitely at some point lose some games for sure, westham isn't the strongest of the team or club playing in this season, so the fact that Chelsea were able to defeat them shouldn't make us begin to see Chelsea as a mini-god that can't be beaten by other clubs.
After that terrible first game, it is definitely great that Chelsea had an easy win. They needed that one because it looked like they weren't going to be that great. This is important because they didn't win just with one or two goals, they scored five goals, and won in a dominating way. That shows that they are normally very good when they play like they are at their 100%.
Now they need to just fix the inconsistency of the team, and should be able to do a lot better. Spurs looks awesome meanwhile. They are two out of two, and they beat City on the last game, they looked strong against PSG as well. Nobody really expected them to have such kind of "turn the ship around" this quickly, look at United they are still failing. Spurs will be a team to look at this season.