Bluesky does not federate correctly. As a consequence I cannot see the post he's referring to, and I cannot reply to him.
I don't like federating with BlueSky with a required app facilitating every interaction. It seems like a man-in-the-middle attack you agree to.
https://fed.brid.gy/r/https://bsky.app/profile/did:plc:rgzw2gfpyanm42hqkxvewh7l/post/3lqjk6kix422r