The breathless reports that antibodies fade out are absurd. All antibody production fades, but immune memory cells persist and if the infection is reintroduced the B cells will rapidly trigger an immune reaction. The way that antibody fade out is being portrayed as a loss of immunity is profoundly ignorant of the immune system. You would not want your body to be producing full scale antibody responses to every pathogen you’ve ever encountered as it is energetically intensive and would harm the ability of the body to react to new threats

Immunity is substantially more complicated than it's usually summarized as in the popular press - it's not binary and can't be fully measured through the amount of antibodies in blood samples. As far as I know, health authorities are still comfortable working under the assumption that substantial immune protection will persist for a year or two.