You too see the quoted posts?
It seems like a "feature" of the client he is using.
quotingSo, fiatjaf (npub180c…h6w6), the founder of Nostr, now uses a client which randomly adds meaningless "e" tags of type "mention" when he replies to a thread, pointing to some previous item on the thread.
nevent1q…aks9
The standard thing for a client to do when displaying such posts would be that of showing the referenced note as a quoted note. I don't think this is the intention.
Why do client include tags that make no sense?
See this posts for instance:
nevent1q…764u
nevent1q…renl
nevent1q…4ck2
nevent1q…zfrf