Sadly, it may be real. ASMR Spanglish recently got his instagram account hacked as well, resulting in his account having a photo and story of "His girlfriend's ass." It was pretty convincing, but eventually he got the matter fixed and addressed that it was not him.
With gmail accounts, its a bit more trickier. Once you don't know the password, going through the steps of verifying its you is oddly difficult. You can try to press forget password, but you have to submit a backup email to send the code, which doesn't always work. Sometimes, google will for some reason say they could not verify you and you'll basically lose the account forever. If he can successfully get his password changed, then everything will be back to normal. But if not, unless he has a backup of all his videos, he basically lost his entire channel.