"Correct me if I am wrong but this approval was rather quick was it not?"

Not really. Original PDUFA date after sNDA submission was Jan 2020. Then they received word that they were granted priority review with a revised PDUFA date of September 28, 2019. Then they received word that there would be an AdCom and the PDUFA got delayed to December 28, 2019. The actual date today was a couple weeks earlier than expected, but not outside of norms.

BDAZ