Maybe this is in the part of the article behind the paywall, but what about GM's other brands? Wouldn't dealerships that sell other electric cars like Chevy Vo

Maybe this is in the part of the article behind the paywall, but what about GM's other brands? Wouldn't dealerships that sell other electric cars like Chevy Volts require the same sort of equipment? Is there something special about the Cadillac equipment that's more expensive or different than what's needed to service any other GM electric car?