I agree with partial charges, and storage level charging, but the same recommendation for a full, or even a few, full charges when brand new seems to be a common recommendation.
It would be excellent to have some corroboration from a manufacturer level expert, rather than a marketing recommendation.
Minimally, I always do a full charge, then a capacity discharge, to make sure the battery I’m getting is not a dud/fake/old or have a problem.
Once seen as OK, I then charge it to suit my purposes.
I just returned 4x HuaHui Li-on/1.5v/AA batteries for not even hitting 80% of claimed capacity when brand new, nor holding 1.5v even under a modest load (0.5A). Cycling a few times did bump capacity up a tad, but not a meaningful amount.