The questionable email message that this person was reporting describes how this person’s account had been hacked, how changing the password wouldn’t help, and that it was being held for ransom to be paid in Bitcoin. And, indeed, it appeared to be “From:” this person’s email address.
Variations of this scam even include a password — a password that you’ve actually used.
Even so, “complete BS” is very accurate.
Though, if there is a password, then there is one thing you should do.