It says at the bottom of the BIP that the original draft came from Luke. (And FWIW, even before I saw that, while reading, it was pretty obvious to me that that was the case.)
Has Luke denied this? (Where?)
Discussion
It wouldn't be out of character for Luke to propose those but if so, why wouldn't he just use his own name. I don't see any attribution to Luke in BIP 444 but maybe I'm just missing it. Here's a link to the article that says he denies being the author
https://www.kucoin.com/news/flash/bitcoin-bip-444-soft-fork-proposal-sparks-legal-and-moral-debate