Don't know why you think that. Liverpool's situation is not dissimilar to Dortmund's when Klopp came in - floundering in upper mid-table (I think they finished 13th the season before he came in) with a fairly mediocre squad, living on past glories. He turned them around into a force in Germany and Europe without spending much at all.
I think the evidence we have suggests that Klopp would be good for Liverpool, given enough time and control.
I think the evidence we have suggests that Klopp would be good for Liverpool, given enough time and control.