He may be using it as a tool, but that doesn't mean it's not displacing social interaction. Previously he would've had to collaborate with people to get the same stuff done, which necessarily involves social interaction.

AI in its current form, it's not a tool, it's a product you pay a subscription for

Yes it is because it's the next stage in the emergent phenomenon of tech becoming more addictive so that we can't help but develop it. AI puts technology first over the needs of humans and it's harder to avoid.

Not per se, but if you're using it as a substitute for human interaction (like most 'chatbot' style UIs want you to), then yes, absolutely.

The main problem is that talking to AI is like talking to a human without any of the thorny parts. It's only going to be nice and helpful and always available to you. Chatting with AI is to social interaction like candy is to a balanced diet. Sure it's more instantly gratifying but long-term it's really bad for you. You need the thorny parts to build important social skills like tactfulness and navigating conflict.

Depends, if you care for the bot or develop a para-social relationship with it, then yes, it will be much worse. It does not care or have emotions or understand the human experience. It simulates those things through words and that really messes with the human brain.

If you are using it as an assistant, coach, or deep researcher to chat about interesting things with, then no.

Sherry Turkle breaks it down more here: https://www.youtube.com/watch?v=OMiR-GxTrtM