Some are taking that X post (tweet?) to mean that Dell is adding Bitcoin to it's treasury. I'm not sure if I believe that as it seems like this is something they'd want to announce, but maybe they have some formal announcement planned for the future or something. They certainly have the capability to buy $400 million dollars worth of Bitcoin if they wanted to, but as of now I believe that's still speculation.
I guess he felt he wasn’t obvious enough yesterday so today he posted a picture of the Cookie Monster eating bitcoins. It seems like he may be dropping clear and obvious hints and not making an official announcement because maybe his company is still stacking? Anyway, buying is nice, but making an official announcement to kick off game theory would be nicer.