They're not ignoring the science, they're not lying. It's called wishful thinking, and we all do it. According to Associated Press:
Quote:
“Just remember, as a simple rule — rule: Eight months after your second shot, get a booster shot,” he said then, adding that health experts were aiming to be ready to administer them by Sept. 20, pending approval by the regulatory agencies.
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bolded, underlined part my emphasis. So according to the AP, Biden didn't say "You WILL be getting boosters officially effective 9AM September 20." What he said was - if all goes as expected, it'll be ready to roll out September 20.
B is only true if A is also true. If A is false, then B will be false.
B = 9/20 rollout.
A = multiple regulatory agency approvals for 9/20 rollout
It's not A = B.
It's IF B, THEN A.