"What Are Little Girls Made Of?"
Androids a plenty, though I think they are pretty much all gone by the end of this ep
Again...a whole culture of androids.
This would show that Data is indeed either able to forget, or he just never saw this info before. Now, deep down I think the odds of Data researching info on androids about 100 years ago higher than what happened on the First Enterprise two centuries ago.
Just because Data doesn't mention something, doesn't mean he doesn't know about it. Why WOULD he bring these andriods up? They were FAR less sophisticated than Lore and Data. There was a passing resemblance, nothing more.
It would be like one of us saying that we're not alone, because "there were once some CroMagnons" at thus-and-such a place. You wouldn't consider a CroMagnon to be "one of you". Why would Data feel a kinship toward these robots?