HK is much much harder than any soulslike I've played (haven't played Sekiro and from what I gather that's not veeery soulslike either). The early Souls games (DeS, DS1+2) need hardly any "skill", just a bit of patience and a healthy dose of fear of the unknown.
I also thought HK much harder than the Souls games until the second time I've played it. Then it just clicked somehow in my brain. In a way, it's very much like Sekiro in that it requires quick reflexes and a low vulnerability to "panicking", although later Souls games have been increasingly punitive of panicking as they got faster.