What information does hugo.generator collect?

Or rather, send back to Hugo?

Not sure what you mean… it’s a static site. There’s no “back channel” here.

There’s no central Hugo server that your websites can communicate back to.

It is recommended to include it so Hugo can get stats on popularity/usage. This is what I am asking about…

Third parties crawl to obtain stats. For example:
https://builtwith.com/

Alright. I will include it in my site(s) then.