I just tested Notion's AI bot by asking it to make me a new page with the contents of a URL, then confirmed from my server logs that Notion accessed that URL.

It used user-agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36 and connected from an IPv6 address of 2600:1f14:1c1:bf05:50ec::13