No, it's not back to business as usual by no means. There is still a pandemic going on and everyone is very aware of that.
It would be pretty hard to get (or give) a blowjob during a massage session while wearing a mask - so my guess is that the masks come off when the time is right. ..for most people anyway. If someone is practicing safe-measures 100%, they wouldn't be going to a massage parlor to begin with.