I don't think lolcow culture is dead per say.
The Internet will always be filled with laughable losers. I just think classic lolcow culture has died.
Kiwi Farms is as irrelevant as Something Awful these days, websites like Encyclopedia Dramatic are ghost towns, people like Keemstar have now faded into irrelevancy (and people like Keemstar have become lolcows these days), Reddit and Youtube banned cringe communities because of their associations with the Far-Right and other online extremist groups, Big Tech has since cracked down on doxing (with governments around the world making legalization that criminalizes doxing), governments shutting down DDoSing services, the list goes on.
Lolcow culture still exists but now and days it has taken on the form of Youtubers that talk about the Internet most infamous individuals (in an informative and respectable manner), news articles that talk about laughable morons online (in a respectable manner), and even communities that are historically considered lolcows (like the anime community and the furry community) have started to participated in the fun by also making fun of lolcows.
The Internet is always going to have village idiots (look at people like Johnny Somali, Logan and Jake Paul, Cadence Owens, or Nick Fuentes where they can be considered modern day lolcows), it's just that the Internet has moved on from the laughably childish ways of trolling.
To quote TVFilthyFrank, "Listen kids, being edgy is okay but the same damn jokes in a row that's not okay, okay, okay! Like damn, is that all you can come up with? If you're going to be racist, at least be original". If you're going to make fun of lolcows, spamming words like 'Faggot' or 'Nigger' doesn't cut it anymore so you should at least be more original.