Originally thought to be an April Fools joke, it turns out that Capcom really did hide a one-hit-kills weapon in Mega Man X. That platform in Armored Armadillo's stage always did seem a little strange. Unlike the later games, collecting the Hadoken is much more time consuming.
Hetfield managed to improve the previous run by 6.5 seconds, thanks to better lag reduction and overall better optimisation. Please read the author's comments for more details.
If you want to see more of the blue-clad hero, we recommend watching the any% run.