25% miss on AI status moves in Gens 1/2 - rumor or fact?

[xyzman]

In the past I heard a lot that in both gen 1 and 2, AI status moves have an extra modifier for an accuracy check which makes them miss in 64 out of 256 cases. I remember Leer and Growl missing on my Pokemon during the early game in Gold and Crystal but that memory might be false.

Is this true? If so, how does this work? Is it the case of AI status moves always having 192/256 accuracy or it's a multiplier? I.e. is it 75% or 45% for Hypnosis (normal value is 60%)?