It’s a bot that replies to almost all posts with a relay name I guess and just spams your notifications page. You’re probably using nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg like me and that’s why you’re seeing this guy no more. On Damus I still see him. Or maybe it’s a matter of relays. So I’m not sure what the antidote is.