If Magneto was able to physical destroy Hank's body before Hank overpowered him, given his energy manipulation feats, I think it's possibly he could likely disperse his electronic consciousness long enough to achieve a forum win.
Of course, Hank can reassemble himself pretty quickly when it gets down to it.
I think it's fairly safe to say that Cyborg Superman has thought of encountering electronic warfare capable characters and has some kind of counter electro-magnetic tech in play at any given time as otherwise it would be ridiculously easy to EMP him to stop him anytime he went on a rampage and supes would be trolololing Hank with a Kryptonian tech EMP generator/Batgod preptech for the just in case.
I agree with you here I just feel it wouldn't come down to this in the first place. I think Hank would definitely have something in his arsenal to direct counter someone like Magneto considering his powers. At the least Electromagnetic interference with his systems should be a problem with his direct body.
At his best, he can just keep jumping from body to body, or remold it at will.
The "Central node" thing is so stupid, because it ignores all those times he's been smashed apart, and just kept reworking his body into more insane forms...
Hank, at core, is a disembodied electronic consciousness, so, if Magneto could destroy his body - which I don't think is likely at all - I do, however, think his energy manipulation and finesse in doing so could at least disperse Hank's energy signature for a good while.
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that's sorta where i come out of it--i think mags could get some wins by dispersing borg long enough to count as a win. i'm not sure about the odds of his scattering his body though, so i'm not sure who to give a majority to. if mags can't tear him apart, i don't think he can do enough damage to take him out before the borg gets him. and if he has that computer tech in his helmet, he could be f'd from the get go--shield or no shield....