I hate seeing heartwood get pulled when it doesn't have to, but what went on in that video just seems crazy. When I went to the swamps, some of the locals were commenting on our stumps, and were telling us that they "slick stump", to avoid fiber pull...and I guess this video proves that they weren't kidding. The ones that seemed halfway intelligent, we would try to explain to them that we were not pulling any fiber out of the heart, but could still use our "west coast" humboldt and could still use the sapwood for holding wood.
I used to buy a new chainsaw every year. We were getting paid per thousand board feet, and worked 6 days a week, so it paid off to have good tools...plus we were usually so far from the road, that you didn't want your saw breaking down, unless you were getting flown in, then you would have a spare saw in the woods with you.