A bunch of lies. All of the first generation of the vaccines have been tested against the CDC definition of a placebo. Bobby prefers to define placebo in his own way, as either water or salt water, but this generally isn't feasible especially when you already have an effective version of the vaccine available.
Plus, remember the Salk trials? 400,000 people were injected with the Salk vaccine and another 200,000 received a saline placebo. They knew the vaccine was effective because 16 people died in the placebo group and 60 werre paralyzed while nobody died or was paralyzed in the vaccine group. Now what if you had been in the placebo group?
In other words, if you have an effective vaccine you're risking death and severe illness by withholding it from people. Moreover, vaccine recipients are extensively followed after receiving a vaccine to see if any problems arise that weren't caught by the RCT's. This system is built to detect any suspicion of harm, not disguise it.