I actually enjoy very much the latest record (Axis) and, although featuring some rhythmic sections or some melody (as in the final track), it is not techno at all!
Considering all this albums, I would say that HELM manages to fluctuate through a quite diverse range of influences and strategies for building his industrialized electronics: field recordings, SPK, kraut, even on the verge of Anenzephalia at times, and so on and on, and still sounding as music made today!
As for me, I'm very much a fan of Cryptography and Impossible Simmetry. The new one, although on the rise at the hierarchy, still needs a couple of extra spins to find its place!