It used to end with "... and this is what what happened." I would prefer "...and it saved my business" or "...it made me quit." Even removing that clickbaity suffix makes me feel better.
"This is what happened" is just an inefficient use of words, not really harmful. There's not anything meaningful you could append in five words. It didn't save or kill his business, nothing so dramatic.
"You'll never believe what happened" is clickbait. "This is what happened" is about on par with an extraneous comma.
"You'll never believe what happened" is clickbait. "This is what happened" is about on par with an extraneous comma.