This does not matter. SL is owned by Proton and the functionality works…
Has nothing to do with what we were discussing which is being able to transfer aliases to a proton pass account. Which you can do. Easily.
Again irrelevant in that SL has the functionality to link with a proton account.
But also, relevant in that my original point was having separate accounts can be beneficial if you want to save money.
Incorrect. It does mean that. If you have one of Pass+ or SL premium you have both.