No, the author of the addon has tried to make it as easy as possible for anyone without the addon to still be able to get into groups. The addon publishes the group in chat every so often and players who whisper to ask for an invite will still show up on the addon as having applied.
I hate to play this card again but since you guys seem to love pulling this type of stuff out so much:
One of us has achievements to confirm we were actually playing in vanilla, and one of us does not. I know what I’m signing up for, I know what this game is like. Had you bothered to read my posts before, you’d see that I’m not even sure I will personally use the addon. Defending its existence does not mean personally using it.
(And, for the record, I understand that you may have actually played in vanilla and if you didn’t, I don’t care, everyone can play. But I verifiably did, so it’s a little silly to suggest I’m not cut out for it.)
And I feel - and have these posts you guys make as evidence to support - that you guys campaigning against it just fundamentally do not understand how it works or what its purpose is. You keep arguing that it’ll do damage to Classic’s community and conveniently ignore the fact that there existed similar (and more automatic) mechanics in vanilla for the majority of its lifetime.
If you have evidence/reasoning to support your feelings that it will do long term damage to hurt the community, I’m all ears. Go ahead and lay it out. But “feeling” it could happen alone is not and should not be enough to have it banned outright.
A window that displays recent advertisements and has a button to let you send a whisper (that you, not the addon, writes) to the leader of the party so they can consider inviting you is not fundamentally different from the normal chat advertisements, which still exist. It just rearranges the information and prevents it from being spammed out too quickly.
If you have a good reason for why an addon that does just that is damaging, I’m happy to listen.