Why 17 LIV Golf players are allowed to compete at PGA Championship in 2023

The PGA Championship marks the fifth event since the PGA Tour-LIV Golf split in which LIV players will compete with tour players.

source https://www.sportingnews.com/us/golf/news/liv-golf-players-pga-championship-2023/iwimnu9zcori8lwuperje2hf