A number with a question mark behind it is not evidence, and even if hundreds of doctors did speak up about it, hundreds of doctors thought Cholera was caused by miasma instead of bad drinking water. Hundreds of doctors thought bleeding was the universal cure all. Hundreds of doctors thought washing their hands was useless. Some random number of random doctors saying it may be effective is not evidence of it's effectiveness.

Your document also doesn't say what you think it does. If it did, we wouldn't be able to have multiple vaccines approved. Is there any evidence that the FDA would interpret a non vaccine as an alternative to a vaccine, when there's no issue with granting EUA to multiple vaccines? I doubt it, but would love to see what you have.