Ah, ok. So they know that an account number has these public keys. Where as other providers don't know the list of public keys on your account? Depending on how you use the service, this difference is not important. IE, if you use your VPNs from home there is no difference. All of these providers will have your public keys and if they come from a single IP its pretty much the same thing. You do have me thinking about this differently though. For my threat model its not important but I'm curious.

When people think of logs they are thinking of keeping records of traffic that can be linked to accounts which can be linked to identities. This stuff is hard to do privately. Thanks for the info