This issue is simple to link to this repo for the rebuttal of the misinformation present in thread 651
If you arrived here from that thread, and are interested in a deeper dive:
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The rebuttal to xi's claims
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The corrected "Missing Intro to APCA"
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Math Lies and Videotape a critical dissection of a blog post xi made, asserting misinformation regarding the field.
The TL;DR is that while xi's motivations are unclear, his statements and links indicate his cooperations with or association with certain obstructors who have been harassing me personally. The nature of xi's repo and the Silver thread is one of obfuscation and creating confusion.
xi my his own admission has no credentials nor understanding of vision science, and he, like the others in the obstructor group, have ignored good faith attempts to provide the relevant information.
w3c/silver#651