And even then the witch magic came many years later, so it still doesn't explain how he survived in the moment. ( Unless he had been 'pre-magicked' at some point before TPM? ) One possible excuse is that he was an alien and we don't really know anything about his species' biology.
Wasn't there some bullshit about Maul's anger keeping him alive? Admittedly, I might be making that up.
Edit: No, I was right. Per Wookiepedia:
However, through his hate and rage, Maul managed to survive being cut in half as his top half fell down the reactor shaft and into a trash container.[20] A combination of his Nightsister magicks, Dathomirian physiology and Sith tenacity served to keep him tethered to life even as his sanity began to leave him.[28] Maul's shattered body was dumped on the junkyard world of Lotho Minor,[44] where he lived in the bowels of the planet. There he utilized discarded metal to fashion for himself a six-limbed apparatus that allowed him to walk again.[45]
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