And those pdf's don't mention the other big hazard, that the fall arrest and travel restraint gear can get tangled up in the form. I don't know what happened or if they were even flying forms when he fell, but if someone were to step through the form as it was being pulled out they'd end up getting dragged with it.
As far as I know that's never caused a fatality in Ontario, but I do know of more than one fatality where someone's lifeline, lanyard, or harness got snagged and the worker was either thrown or dragged or knocked off something. Not that I'm in any way arguing against the value of fall protection, but that's why ironworkers are exempt from fall protection regulations in some situations in some jurisdictions. When the regulations were first put in place there was a spike in incidents because lines were getting snagged, and an option was given to connectors (who usually had nothing reasonable to tie to anyway) to decide whether or not to tie off. The exemptions don't exist in Ontario, but they're not uncommon in the States.