Did they use fresh or canned pineapple in the video? The canned stuff will only lend flavor to the dish, but fresh will do as stated above. It's the same reason you need to use canned pineapple in jello and not fresh. Fresh can stop the jello from setting due to the enzymes.I was just looking for more tender. Got the idea from Gugafoods on youtube, an accidental stumble-upon. They claimed the pineapple marinated steak was better in their tests, just for the heck I thought I'd try. Last time I'll take them seriously.
I take it then that I should not try any sort of tenderizer on any steak I want good steak flavor and sear from?