Random people calling 911 on other people filming them is a staple of Youtube; banks, coffee store workers, hairdressers, most especially restaurant managers. I don't know why anyone would expect technicians from Flock to be different. It's worse for the technician in this case, because he really was being followed --- that's not unlawful but it's unnerving.
You'd think from the response that this was like the VP/Sales of Flock Safety. But it's just some installer dude probably making $65k/year to climb poles and fasten cameras. I guess that's praxis for you though.
I think this is just a ragebait piece.