> first sentence for example, any engineer knows that strong water jets can precisely cut steel in seconds, much better than any persistent river over several g

> first sentence for example, any engineer knows that strong water jets can precisely cut steel in seconds, much better than any persistent river over several generations. I agree the whole thing is dubious, but that's a pretty weird criticism to pick out. The sentence specifically says "river" and is true of rivers; the fact that water jet cutters exist is irrelevant.