Dear Dave,
I took ten years of piano lessons, six years of guitar lessons, I play by ear, and I know quite a bit about music theory. In all those years of lessons, I learned to sight read and was taught a lot of classical music, which was lovely, but wasn't what I was passionate about. In the end, I learned a lot of skills but lost interest and put my keyboard away.
Now, to the piano course. Is it the equivalent of six years of lessons and thousands of hours of practice and theoretical study? No. And it doesn't promise to be. Am I using my ear to figure out some chord progressions and songs I've dreamt of learning for 30 years? Yes.
Also, the course will indeed get a beginner playing the piano in 21 days. There's no trick to it, as it requires practice. Most students in the course take a lot longer than 21 days, but one can get through it in that amount of time.
By the way, the author of this course, to my knowledge, has never advertised on television. Perhaps you have him confused with that bald guy on tv who has a similarly titled course called "Piano In A Flash?" This is not that.
Lastly, being profane is not really that useful or attractive and undermines the good faith of this community.
I wish you well in your musical journey. I am overjoyed about learning to play the piano again.