I'm really not getting the appraisal for this dude.his stuff sounds like demos done on newer analogue as apparently the only thing he uses is an Elektron Octarack and Monomachine.you can tell most of what he is using is analogue but it's definitely modern sterile analogue aka Elektron

as for the synthesis it self.i don't think there is any doubt that any of this is not synthesis.it blatantly sounds synthesised and the only incline to suggest otherwise is the addition of some not very convincing reflections (reverb).basically for the metal stuff it'll be messing around with tuned comb filters and "karplus strong" synthesis which is messing around with short delays in feedback loops.reaktor is pretty good for shit like that .you can also make a lot of inharmonic sounds metal etc with PM.as for the plastic squishy and crunchy timbres.that is just pure ACTUAL FM,probably filter FM too with the addition of white noise to simulate the intense amplitude modulation that goes on in those sounds
the bubbles literally just sound either like a self resonating bandpass filter tightly enveloped (it helps that he is using analogue in this case) or some kind of primitive PM patch.if you wanna hear convincgly synthesised bubbles, check out Tipper.da bubble synthesis king
I know this was a while ago but nobody has replied (up until now)
In closing though this dudes stuff is awful, but i think that is the point