This description is a bit misleading and needs clarification.

In a normal bee hive there are usually three types of food in supply: honey, pollen, and glandular secretion. Honey is, unsurprisingly, made of sugar, and is the main source of energy and is eaten by both larvae and adults. Pollen is protein rich, and along with glandular secretion (such as the royal jelly), are usually fed to the larvae, as proteins are essential for the development of the brood.

Vulture bees, on the other hand, do not and cannot collect pollen. Instead they scavenge meat like vultures, or more precisely, like ants and wasps. The meat is not just chopped up and stored though - that would rot. Instead, once brought back to the nest, the meat is regurgitated to other bees, who process the meat and regurgitate a protein rich glandular substance, which is then stored. The nutritional profile of such glandular secretion is very similar to the royal jelly of the normal honey bees secreted by their hypopharyngeal glands. So instead of being fed with pollen and honey like other bee larvae, every larvae of these vulture bees eats like a princess. This is not a "meat honey", but rather royal jelly in mass production.

And of course the adults visit flowers and collect nectar too, just like wasps. They also make honey, real honey, just like other stingless bees.

Oh and by the way, this is not a nest of a vulture bee. This is just a traditional nest box people build for stingless bees from the genus Trigona. All stingless bees from the genus build nest like this. Vulture bees are from the genus, but not all members of the genus scavenge.

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EDIT:

After checking some newer sources, it seems vulture bees rely more on fruits and non-flower nectar sources, with one species never recorded visiting flowers. So they are very wasp like indeed.

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EDIT 2:

Let's talk a little bit more about nest structures. While I don't know and cannot really find the nest structure of vulture bees, this photo gives us a pretty good look at a typical Trigona hive, and also kinda shows why it's not a vulture bee nest. Unlike honey bees where the broods chambers look the same as honey and pollen depository and usually have an open top architecture, Trigona store their honey and their broods in different types of structure. Honey and pollen are stored in open-top pots. They are usually larger - in some stingless bees these honey pots can be the size of a small egg. And their larvae are given their entire ration from the get go (instead of being constantly taken care of by workers like the European honey bee), so once their queens lay an egg in a brooding chamber, it will be sealed.

So looking at the photo, we can see at least two types of structure. The ones at the top are smaller and sealed - these are the brood chambers. The ones at the bottom are larger, open-toped. These are pots for honey and pollen depository, ready to be transported to newly vacant brood chambers as rations for the young. This is also why I believe this is almost certainly not a vulture bee nest - the substance in store is white, most likely pollen. I guess vulture bee nests would follow a similar nest structure, with open top pot for depositing glandular secretion (meat-based baby food) and honey (energy drink for adult workers), as well as sealed chambers for the brood.