Yep, that mount specifically is extremely common for a lot of label slapper companies. Like they all look like that haha. Hex bolts to make it easier to attach, the pendulum mount, the cap, set screws and all.

Never seen a flock ptz camera myself so I guess I can't say much about that specifically.

I couldn't find any other cameras that have all the same physical characteristics that weren't just pictures either on Flock's website, or from other sites talking about Flock cameras.

I'm not entirely opposed to the idea that they're using an existing design, but it seems more likely to me that they simply had one custom-made, especially considering the fact that they have very specific needs, such as the ability to accurately read a license plate on a car, which they claim they can do while it's going 100mph, at 75ft away, both day or night, or the fact that their cameras have cellular connections built-in, which would require the existing design to also have a slot for a SIM card, or ability to install an eSIM.

Again, not saying it's impossible, but I'd consider it unlikely.