These kinds of Elon Musk posts are just misleading. It's not harmful but Elon isn't doing some technical analysis of why Bitcoin will be bullish. He's just making an innocent joke and for some reason, people put too much weight on whatever he says.
Even if he's joking his theory has some validation if you look at the price action of bitcoin since 2009.
Bitcoin always broke its resistance and it happened again last week When months old resistance was broken.
I'm certain bitcoin will reach 100,000$+ in the next 2 years and could go over 500,000$ in the next 10-15 years.