No, in fairness, Klopp is both building and buying.
Last year, his team were excellent but not good enough to challenge for the very top positions.
They had to acquire a world class keeper - Karius's errors and lapses (and doubtless slump in confidence afterwards) at the CL final could not be allowed to cost them in the future.
They are not building through the young academy though. It’s a let’s just buy up everyone we can.