From that PDF:
"Other particularly savvy honey-making imposters go as far as to feed bees sugar and syrup to produce honey, rather than natural foraging — severely impacting theproduct’s nutritional benefits ..."
Beekeepers sometimes DO feed their bees... to keep them alive. In the late winter/early spring, if the weather warms up, bees may go out to look for food. There probably won't be any plants in bloom. They may also have eaten their store of honey, which is their food for the winter. So in February, it is VERY common for northern beekeepers to feed their bees a mixture of sugar and pollen. If the spring bloom is late, in other words, there is a dearth of nectar/pollen, beekeepers feed their bees sugar syrup. Else the bees would starve.
Late in the season, when there is another dearth, bees are often feed plain ol' beet sugar. This feeds them so that they don't have to break into the honey they've stored, and helps that last through the winter.
The goal is to keep the bees from starving. If they have not made enough honey -- for whatever reason -- they need something to eat during the winter to make it through.
They also need to eat to make wax, not just honey.
A colony of bees is about $140-165. Not cheap. You do what you can to help them keep them alive and get through the winter.
Anyone adding anything to honey but claiming it's pure honey, on the other hand, is ripping people off.
my mother used to keep bees before her neighborhood became densely populated area. she did feed her bees when there was not enough forage. if I remember well she made a sort of syrup with 3 herbs, lemon balm, wormwood and mint. she made a strong tisane then added some sugar.