If you look at the cases of paralysis after a vaccine, and they are incredibly rare, they are:
Guillain-Barré syndrome - this is a rare one that is associated with a virus infection. There has been some talk of this being an extremely rare case with Johnson & Johnson vaccines - but these were not used in Thailand
Bells Palsy - affects the face, so it wasn't this. Also, recent studies have shown little or no link between mRNA vaccines and Bells Palsy.
Transverse myelitis - there have been a few case reports of this after vaccination - all of them were older people. And all of them were related to adenovirus vector vaccines not mRNA and were only reported on VAERS, so self-reported, not in clinical trials.
Neuralgic amyotrophy - same as above, only on VAERS and not found in any trials