Do you have any examples of this to show?
Throwing out excess bitrate cannot affect a picture in this manner (aliasing). That's just technically not possible. I can see how visible macroblocking or mosquito artifacting could sometimes look like aliasing -- but even then, not really aliasing.
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helps a lot to eliminate the aliasing from the interlaced source
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Huh? That sounds like you're suggesting interlaced video be deinterlaced. Deinterlacing video definitely added aliasing artifacts, though the severity can vary from method to method. HDTV sets all scale and convert progressive.
Interlacing can be aliased in nature, but nothing can fix that (not even deinterlacing, which just makes it worse). Well, I guess you could blur it along an axis or two, but then you'd lose resolution and detail.
Again, would be interesting to see some samples of it.
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