What did the Nyaa comments not include?

My personal concern from the settings alone would be the use of (single pass) ABR.
To the encoder's credit, he does link to someone's explanation, but unfortunately, it seems questionable to me, for example:

It's actually the other way around. With (single pass) ABR, the encoder is constrained in terms of bitrate allocation, and adjusts quality to compensate.

I'm not sure he's confused, or missing some point:
- he claims that his method prevents color banding on low-motion scenes
- he claims that color banding is noticeable on high-motion scenes
- am I supposed to assume that his argument for low-motion also applies to high-motion?

Anyway, x265 provides a qcomp option if you don't like the default bitrate allocation between simple/complex scenes - there's no need to try to invent your own (questionable) scheme.

It's possible that the person is talking about 2-pass ABR, which is different altogether, but this encoder only uses single pass, and "2-pass ABR" is generally labelled "2-pass" and not "ABR". Also, considering that he recommends hardware encoders (yeah, seriously...) leads me to doubt he's wasting time on a second encode pass.