we can take this analysis a step further by seeing that in this case, the tsunderes are actually being portrayed as weak. i think there's another key aspect to this in that the brutalization is always portrayed as a joke-their "abuse" actually isn't a big deal or worth taking seriously. there are a lot of reasons why this could be the case (e.g., double standards with gender in regards to abuse), but regardless of these reasons, we can see a trend in which the focus is on the tsundere's violence being "broken down" and revealing her deredere side due to the mc's influence over her. the satisfaction comes from the fact that the tsundere's development is entirely based around pleasing the ego of the mc (for being nice) and fulfilling the fantasy of a girl who hates you secretly being deeply in love with you. in a way, the physical violence could be a flanderized way of representing that. essentially, no matter how vicious the tsundere is, she will always be "tamed" by the mc in the end. this also isn't just a thing in japanese media btw, the idea of an aggressive or defensive woman eventually being made submissive due to the influence of a male mc is a pretty common trope throughout the world (hence my use of the word "taming", like in shakespeare's taming of the shrew).
this is is mostly an aside, but i also think it's curious how yanderes rarely ever get the same flak despite being just as, if not more abusive. a part of me thinks it has to do with the fact that the more visibly unpleasant aspects seen in tsunderes (violence towards the mc for example) are not as readily apparent. yanderes are automatically said to construct their entire egos and motivations around the mc, so they do more to immediately serve the mc's interests.
this video does a pretty good job analyzing the narrative roles of tsunderes imo: