If you read the notes you'll see scary terms like "buffer overflow" but "probably wont work on windows because windows uses /GS." I think Tavis does good work but the interpretation of his work is often hysterical. Finding an issue with AV doesn't invalidate the concept of AV. AV is just software. Bugs get found and patched like any other software. I think accepting that isn't asking too much here. Defect-free software is so far humanly impossible for non-trivial applications, let alone for complex security applications. Heck, how many security defects has the linux kernel and openssl had in the past couple years alone? Dozens, or more, and all have been weaponized and trivially exploited. Yet we still use that stuff.
Grandma's PC, the PC of a random staff person at work, etc without AV is taken down near instantly. With it, she can avoid many of these security issues. The idea that some defects means AV is without value is a fun and popular opinion with techies, but in the real wold, it does far, far more good than harm.