Lol this Major Joseph Murphy is, pardon the pun, batshit crazy.

He's conflating an aerosol spike protein vaccine administered to bats (i.e. a nasal vaccine) with a a full fledged virus (that he thinks became SARS-CoV-2). He also seems to think that said bat vaccine/virus was based on a nonexistent virus that targeted humans (can't have been SARS, since SARS-CoV-2 is so different from it) which was changed to target bats for the vaccine, and thinks that administration of the vaccines will cause the virus to be selected back into a variant that is deadlier to humans like SARS.

Basically he's a conspiracy theorist + anti-vax nutter who has no idea what's going on here.