It's not per donor. Their total transfer volume last week was €1,589.34 according to the website. As far as I can tell, the only project with more than €100 in weekly income is Liberapay itself.

EDIT: I see now that they cap donations per donor and recipient at €100 per week, but it doesn't seem like anyone gets close to the cap.

There may be donees who receive more than that but don't make the amount public, but you are correct about the total volume.