From Scott Aaronson's blog (linked in the article):
> Another Update: In the comments section, my former student Shalev Ben-David points out a simplification [1] of Huang’s argument, which no longer uses Cauchy’s interlacing theorem. I thought there was no way this proof could possibly be made any simpler, and I was wrong!
> Another Update: In the comments section, my former student Shalev Ben-David points out a simplification [1] of Huang’s argument, which no longer uses Cauchy’s interlacing theorem. I thought there was no way this proof could possibly be made any simpler, and I was wrong!
[1] https://www.scottaaronson.com/blog/?p=4229#comment-1813084