I think it's more that they have a paper thin squad and their recruiting has been mediocre ever since the spent that fortune on van Dijk, Keita, Alisson and Thiago. One injury and their team is in disarray and what Klopp expects from his player lends itself to higher chance of injury. The core is fantastic - one of the best in the world, but once one of their superstars falls out of form or is injured they fall apart.