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He's stated that multiple times already, it's also in the books written about him... I mean literally since years already - not really 'news'.

"The most entertaining outcome is the most likely." - Elon Musk

"Responding to a Twitter thread started by AI researcher Lex Fridman, Mr Musk agreed a “Mars economy will run on crypto”, suggesting it could be with the novelty cryptocurrency dogecoin or the fringe cryptocurrency Marscoin." ... "Dogecoin could be a more likely candidate, given it continues to be relatively popular and shares many of the same decentralised attributes as bitcoin.

A lot of people did notice those articles, they're all over the www.