An episode featuring YouTuber Siraj Raval, published in October 2019, was deleted afterward.
There was no official statement regarding the deletion from Lex. It seems safe to assume that that was because Siraj Raval had received widespread criticism over plagiarism in his research papers, his controversial AI course, and publishing source code on GitHub without citing the original sources.
Archived audio of the hour-long conversation is still available on the Wayback Machine. On Nov 15, 2021, the video conversation was re-uploaded by Siraj Raval on his YouTube channel.
To date, there is no other known case of an episode deleted after publication.