If Bisseck just let the ball pass him, it wouldn't be a goal for Genoa. Someone was still behind him. Hard work from Thuram scored two goals became meaningless caused by him. Very disappointed when Genoa gets a penalty. And last, overall, Inter Milan's performance is not bad. But, we have a loophole in our midfield.
Serie A 2024 - 2025 only begins and there are many matches left for them to defend their Scudetto. In a first match of season, Marcus Thuram scored two goals that can give him more confidence and has a more goal productive season than the past one. If Marcus Thuram can maintain such excellent goal productive performance, Inter Milan will have very powerful dual attacking players, Lautaro Martinez and Marcus Thuram.
It's not bad even if you lose points as the best team in the whole Serie A. Inter Milan had a good performance and they won the last season in this league while they even had had good performance in the two years ago. I think Inter Milan's performance is strong enough to earn more points and get themself to the top side of the table like they did in the last season and losing two points won't be a lot for this team yet.
However, I think the main reason for Inter Milan to lose points was the mistake of the defenders, not the whole team.