Probably not true. And don't trust rumors. You might have read tweets from scammers trying to spread a pump and dump movements. Don't trust them. This might only trap your funds. These days a lot of people are using names which are popular in crypto like Elon Musk, Vitalik Buterin, CZ, etc to spread fake tweets.

Why don't you head on to Elon Musk's twitter account itself and look for this rumored tweet?