Also bad:

What did they use to stabilize the mRNA?

If they’re managing to do it with just temperature and maybe glycerol, that’s great.

If it’s RNAlater, then that’s going to have safety issues. If it’s something else, how was the additive tested for long term safety? (Vaccines like this have been in the works for a long time. There has been time for safety studies.)

Edit: RNAlater MSDS sheet: https://tools.thermofisher.com/content/sfs/msds/2012/AM7020_...