Well yeah, you cannot completely cut deduction off the table. Not even in the real world. The fact though that the internet makes it easier is of course true. Even Tor is vulnerable to deduction-based MITM attacks using nodes that log activity. Nowadays though I think it matters less and less what you access, since everything in the internet has been reduced to a handful of huge websites (fucking SEO). If you're in one of them, I doubt DNS info are going to be much of any use, apart from them having accessed Facebook, or YouTube. When I'm doing stuff I want hidden though, tor and DoH are a must.