Yeah, lots of questionable assertions made there by author and/or interviewees, eg:
> “I don’t think anybody contests that free-living bees have a better, easier life,”
This feels wrong - supplemental feed, internal space that grows and shrinks with their colony size, well insulated & single-entrance (easier to defend) home, a mesh base they can push their detritus through, pest / predator control, etc.
The bit about wild colonies:
> The bees lived in smaller groups, relatively far apart, which made it harder for varroa to spread. They swarmed every year, which broke the reproductive cycle of the mites. (If a colony swarms, the nest is left without bee larvae, which is where varroa mites take hold.)
The relatively far apart thing isn't a natural consequence of wild colonies, unless there just isn't food to sustain them. (If there is, then bee / nest population would increase.)
Swarming every year isn't guaranteed - I suspect even new 'wild' queens don't get itchy feet until their second birthday.
But even if they do, swarming doesn't mean there aren't larvae in the original nest. A normal swarm process means the original colony is without an egg-laying queen for maybe 10-14 days. However, assuming the departing queen was laying up until departure, you've got ~8 days of larvae in that nest, and that means a further ~13 days those exist as pupae (which I understand are also vulnerable to varroa). At that point your new queen's progeny are already into their larvae stage.
I do get the pastoral idyll being painted by some of the people involved here, but I'm unconvinced.