Good point!
His Twitter page does not include his article, and when you "tweet" him, he has it set so that the tweet goes to him only and is not sent to his page (unless he approves it). Did you ask him if he's heard of Ultraflix?

I just asked him if there is a reason why he did not include Ultraflix in his article. But, he has not replied.
https://twitter.com/sliceofginger