I would refer to this:

If we consider the small daily
intake of honey, its contribution to the total
daily intake of oxalic acid is negligible. Thus,
from a nutritional point of view, oxalic acid
should, like formic acid, also have a GRAS
(Generally Recognized As Safe) status.

Moreover, no significant residues are
expected after oxalic acid treatments.

Indeed, there is no risk of honey residues
after all types of oxalic acid treatments.

Jean-Daniel Charriére & Anton Imdorf (2002) Oxalic acid treatment by trickling against Varroa destructor: recommendations for use in central Europe and under temperate climate conditions, Bee World, 83:2, 51-60

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