But pressing and workrate is his thing. High line or low block his core principles remain the same. He doesn’t revert to packing men deep and hitting long balls. What is EtH philosophy?
There isn't a manager out there that doesn't use pressing or workrate, it's like saying that marking and sprinting are a manager's thing. Klopp doesn't have a singular philosophy which is true for the vast majority of managers including ETH, now they may have tendencies in particular situations, one of them for Klopp could be the heavy use of gegenpress when he was in germany or an emphasis on possession since 2016.
Tendencies that ETH have had for a few years are for example using fullbacks narrower than usual and even having them run inside channels, the use of a mid defensive block, he likes his strikers to actively participate in the building phase and not just wait around the box unlike for example LVG or starting attacking movements on the ground with the CBs.