I think there is a difference between getting shocked by the police, and willingly in a controlled environment.

The police doesn't know or doesn't care about the conditions of their victims, who are often on drugs. In the article, the victim was "really, really, really bad” and wanted to go to the hospital before getting tased.

Here, hopefully, the employees are most likely asked for medical conditions and they are not on drugs. They are shot from the back (probably safer than on the front), there are people next to them to cover their fall and they are wearing safety goggles. They are also not shocked repeatedly. These are ideal conditions that almost never happen in real life, and I guess that although there is a risk, it is very safe.

And high heels have definitely caused (often minor) injuries to the wearer, like from falls. And maybe a death or two, who knows.

I am no saying that getting tased is good, just that in these controlled conditions, you most likely won't die. It fact, it may be less dangerous than alcohol fueled "after work" parties, which is also the kind of thing where "opting out" may be difficult in some companies (which may also include Axon).