That's half my point though...we train a certain way for when we're playing 11. We kept playing that way when they had 9. It's early days but I thought some alternate thinking/approach might have been needed, especially as the original approach clearly wasn't getting us anywhere.
I'd probably would have replaced Sarr with Veliz earlier,(with 9, their counter attack potential had gone) then overload out wide to get more byline crosses/cutbacks in.
The number of players is a red herring it's no different than facing a park the bus/lowblock team but Liverpool actually having 1 less player than that in a 5-3 formation rather than 5-4
I think the issue wasn't the tactics or numbers but as Ange said a panic about the work and a lack of calm. If we had played the same with some patience and exploited the numbers better we would have won easier IMO.
The plus is we made changes and thr extra legs worked in our favour.
I think like most things there is sometimes an over analysis nature to things.