In that movie, the Silver Shamrock Company creates strange android assassins for reasons related to that movie’s absolutely bonkers plot.
The crux of this argument comes strangely from the only movie to not feature Michael Myers in it, Halloween III: Season of the Witch.
Following The Curse of Michael Myers, the franchise was retconned, with 4, 5 and 6 ignored in favor of Halloween: H20, serving as a sequel to Halloween II.
A new, rather convincing theory suggests that Michael Myers was a cyborg.