This is flawed logic. Polio is an RNA virus and is nearly eradicated. There are wayyyyyy more reasons why influenza, sars-cov-2, and HIV are challenging to vaccinate against.

It might go somewhere, but at this stage, these results are meaningless. I posted a version of this comment somewhere else in this post but basically seeing antibodies after injecting a foreign antigen is expected and has no bearing on whether those antibodies are effective. This is an extremely routine process. It would be like trying to craft the perfect barrel of whiskey and your test to determine if it’s the best barrel of whiskey is to light it on fire. Of course anything with alcohol will ignite but that doesn’t mean the whiskey tastes good. This is just too early to be excited about a potential vaccine

There is almost no scenario in which a foreign antigen would not induce antibodies. This means nothing without efficacy data. It can’t even be described as “promising”. This is like trying to craft the perfect barrel of whiskey and the test is “does it light on fire?”. Well of course it lights on fire it’s alcohol regardless of how it tastes.

More important in this context is the concentration. Methanol at a certain concentration will 100% kill the cells but a high concentration isn’t needed for cryoprotection. As always, dose defines the poison.