Well, but the same applies to ALL of these functions. Use C-h f on consult-grep, consult-ripgrep and consult-git-grep. And you either see the C-u thing or two texts saying
See consult-grep for details.
And this text exists even for consult-git-grep.
And I'm fully aware that this is not the full solution, this is why I wrote "this is part of the answer".