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Got a source for this myth
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No readily available source, since the situation was dealt with quickly before any serious problems resulted.
A quick search found an old thread on Glock Talk where this was being discussed in relation to the OD frame, with many opinions but not much in the way of fact.
The black pigment originally used in Glock Polymer frames is highly Ultraviolet resistent. I have a tool bin made of a softer plastic with similar black pigment that has sat outside in the sunlight since 2003 and shows no sign of degradation, while the bin next to it without the black pigment disintegrated after less than half that exposure.
If the present non black colored frames are holding well thats fine, as I remember it the problem was discovered quickly and dealt with quickly. But as with the other numerous upgrades and recalls, its best to be sure any used Glock you run across doesn't have any hidden suprises.