> ~142 kg of pollen annually.

This number for annual pollen consumption raises many red flags. First, no support. It is as if they pulled a number out of a hat. Second, it should be a range. If this number is the average, then it's even farther off the mark. A quick search finds quite a different picture.

Annual Pollen Collection

Various attempts at quantifying the volume of pollen consumed by a colony have ranged from 25–55 kg per year. If the crude protein levels of pollens are low then the volume bees collect will need to increase. What the various estimates of annual pollen consumption fail to take into account is the consumption by adult bees in their first two weeks after emergence. Somerville (2005)

The annual pollen needs of a normal-sized honey bee colony range from 17 to 34 kg (Keller et al., 2005; Wille, Wille, Kilchenmann, Imdork, & Bühlmann, 1985). M. Thom (2016)

According to Winston (1987) and Seeley (1996), annual pollen collection ranges from 20–30 kg/colony, though no sources or supporting data were provided. Rodney (2020) 

PLB

comment: Whoever wrote that should find a different career path

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