That's true on a hyperlocal level. Drones typically mate with a queen from another nearby colony, not their own, which could be their mom.
"They get kicked out as it gets colder," Mays said. "Because they don’t do anything — they don’t sting, they don’t forage to collect pollen or nectar, or anything."
You can tell drone bees apart from other bees by their slightly fatter bodies and bigger eyes. If they manage to successfully mate with a queen, they die instantly, since their stomach and genitals are ripped right off in the process.