The point is, yes there is, and that it doesn't matter if the document would fail in a court challenge, it's still the document they wrote and the terms they obviously want and think are reasonable, and so it is only reasonable to assume they will try to defend them.
If you want to flout them and get them to sue you so that you can force it to be challenenged in court and hopefully you win and open the door for everyone else, I'm sure they would all appreciate it.
But even aside from whether it would hold up in court or not, it's already a problem that they even tried to claim such things. They should absolutely be criticized for that.
It is not only impeccably fair to criticize them for that document, but there is no more perfectly fair and unassailable way to do it than by simply taking it at it's word and adhering to what it says.
No matter how you try to slice it, it's just not even slightly unreasonable to simply do what the Rust Foundation commanded everyone to do.
