I think you're both right. They should probably avoid google AND it probably matters less by comparison than, say, not using a VPN at all. 

What would kill two birds with one stone is having a customer support option like SimpleX so we don't have to use email in the first place. That would keep anyone, including Mullvad tech support, from knowing who you are. 

 Yeah I agree with this.  My issue is a philosophical one, not a genuine privacy risk to the anonymous Tor guru w/ a SimpleX