Why doesn't South Korea just purchase hydrogen fluoride, fluorinated polyimide, and photoresist chemicals from the US since Japan refuses to export them in their trade dispute?

https://www.quora.com/Why-doesnt-South-Korea-just-purchase-hydrogen-fluoride-fluorinated-polyimide-and-photoresist-chemicals-from-the-US-since-Japan-refuses-to-export-them-in-their-trade-dispute/answer/%E6%A1%91%E7%94%B0-%E5%81%A5%E5%8F%B8-Kuwata-Kenji?prompt_topic_bio=1

"Japan refuses" Your perception is nonsense.
Do you know only Korea's "lie information"?
Japan has not refused.