This guy didn’t have a foreign accent: https://m.youtube.com/watch?v=IiYdUE3f4hQ
I’m sure there are countless others.
Bumbling oaf villains need to fall somewhere well short of menacing.
Consider the classic cartoons Inspector Gadget and Danger Mouse.
Now, in its native context as a BBC program Danger Mouse is dominanted by native (therefore English) accents. Inspector Gadget likewise by American, even Dr Claw. But there is a pecking order of how intelligent masterminds be minions sound in both. Minions seldom sounded thoughtful. The more intelligent sounding the villain spoke, the greater the likelihood that they were someone the heroes needed to take seriously.
Gargamel was never meant to be a truly menacing villain. So though he was obviously intelligent and malevolent they needed a voice that didn’t make kids expect he was ever really dangerous to the blue protagonists.