I think you were a little harsh to tpcook, maybe there were other anti-vax posts or something, but his statement was what I was thinking as well. It is inaccurate, but posting something inaccurate doesn't mean someone is lying or anti-vax. Here's a better article about it. In short, lack of anti-bodies does not mean you aren't protected, the instructions to fight off the virus are still there. As I understand it, anti-bodies would be created again if exposed to the virus.

https://www.pbs.org/newshour/health/covid-antibody-test-after-vaccine