“Don Post Studios had nothing to do with any Halloween film.”
Wrong
Correction
It made the Halloween III masks and supplied Kirk masks to Halloween II.
The AFI Catalog credits Don Post Studios for the Halloween III masks and records shared merchandising profits. What Wallace denies is a role in altering the 1978 mask; he says that work was his.
What people actually said
“Wallace said Don Post was heavily involved with the third film's masks but not with the original film mask.”