I cannot say unequivocally that this armor won’t stop a .50 cal as I have not seen it, but I would be absolutely amazed
There is video of body armour stopping .50 cal, but as I mentioned in #48 the shock wave is going to turn your internals into mush. A primer.
https://www.ncbi.nlm.nih.gov/books/NBK202251/
It was said the Erebus DC-10 crash folk were all killed by the shock wave of impact being transmitted from the floor up through their legs, noting that they wouldn't have felt a thing as the internals turned to mush before the nervous system could send a message to the brain. Go to 5:55.