Based on CNN's article, I conclude this claim is true, but it seems Elon Musk is simply trying to make a mockery of the news channel. CNN is known as a very reliable source and thorough in fact-checking. In this article, they explain that Elon Musk, Donald Trump, and Joe Rogan have all been tweeting back and forth to each other about the idea of buying MSNBC and how funny it would be. They seem to be doing this as a form of mockery, considering Musk's past comments about his hatred for the channel. But it's worth mentioning that Musk did the same thing as well before buying Twitter, now X. With his past actions and his wealth, it's possible for the purchase to be made, but Comcast has not made any mention of if MSNBC is being put up for sale.