Apparently, the owner wanted to make money out of it by selling it as NFT on Opensea.
I would say, that this is one of the most popular tweets in the whole crypto space and probably in the whole financial sector overall. That this guy wants to sell it now as an NFT shows that he is still up to date with the crypto market or at least, that he has not completely abandoned it. Usually i think that the NFT topic is hyped to much at the moment and a lot of people try to make some easy money by selling crappy "art" as NFT. Even though it is kinda the same here, i still think that this is pretty cool and could attract some buyers.