This is misleading in the same way as saying "marijuana is a Schedule 1 drug, the same group as heroin!" Class 1 just means it is a known carcinogen in humans,

This is misleading in the same way as saying "marijuana is a Schedule 1 drug, the same group as heroin!" Class 1 just means it is a known carcinogen in humans, and says nothing about the degree to which it is carcinogenic, what cancers it is connected to, how that varies by intake or population, or much else. Sunlight, salted fish, charred foods, and just about any food packaged or prepared in plastic are all also known carcinogens. Any of those may well be very dangerous, but saying they're "in the same group" means almost nothing.