No, the reason that you cannot use Devoid cards in a Commander deck with a colorless commander is that a card's "color" is not the same thing as it's "color identity". "Color identity" dictates what cards that can go in your Commander deck, not "color". Devoid changes a cards color.

How do devoid cards work in Commander?

A card with devoid is not the colors in its casting cost. It is treated by the game as a colorless object. Other cards and abilities can give a card with devoid color. If that happens, it is no longer colorless, but it still has devoid.

Does devoid count colorless?

Anything that has Devoid is considered colorless, even if it has colored mana symbols in its cost!