For those who (somehow) don't know him: sketchek was a really good Pyro main who consistently uploaded quality content of quirky techniques. He announced that he had a terminal sickness 3 years ago and said he would die soon. (That video has now been deleted from his channel). Today he uploaded this video saying that he faked it all. I'll let him explain it in the video above ^
It's an awful thing he did, but I personally find it easy to forgive him for it. I'm mainly just happy that he is alive and possibly returning with some more videos.
If you didn't know him and want to check it out, this vid of his is a good example of what he does: