It's all lies. If you've had Covid, and have not had a vaccination against Covid, you have natural immunity and are golden. Nothing else comes close to being as effective against re-catching Covid or catching its variants. Unfortunately, if you have taken the vaccine, you have weakened your immune system, and are both more likely to catch Covid or its variants, and are more likely to have a severe case. The vaccine lessens the severity of the initial Covid infection, but heightens the severity of subsequent cases, and the more injections of vaccine you get, the worse the sickness when you catch one of the variants. Once you take the first shot of the vaccine, you are on a train ride to hell.