Bitcoin’s creator demonstrated an impressive mastery of cryptography—- it was made to be extremely resilient (including to quantum computing) and no one has ever broken it despite billions of dollars being on the line. Maybe Musk meant to say that he thinks his product will be similarly resilient.
He might also mean that the secp256k1 elliptic curve (which Bitcoin uses) is also used by their product in some way, such as for a key exchange.
You can read anything with the assumption that the writer is an absolute idiot, but I’d give the world’s richest man more credit than that.