Part of what I do at work is photography, and I get paid for it..... I am most certainly a professional, so that makes me a "pro" photographer.
This is the imaging gear I use....
Cannon 7D, many would consider it to be a "pro" camera.
70-200F4.0 IS lens, an "L" lens, many consider it a "pro" lens.
100F2.8L macro lens, an "L" lens, a "pro" lens
18-200 Canon "superzoom lens.... if I am a pro, then it must be a "pro" lens

(I did not buy or recommend it!)
800F5.6 lens... definitely a "pro" lens........
used to have a "rebel", dropped it 110 feet onto a concrete pad... it did not survive, but it was still "pro" equipment right up until it hit.....
Olympus "Tough" p/s camera... works great in heavy rain.... obviously a "pro" camera.
iPhone camera.... an inspection camera.... if you shove the 7D and lens through a 1 1/2 inch access port it stops working

Since it is used professionally, it must be a "pro" camera.
An assortment of USB webcams, used to let me remotely see where satellite dishes are really pointed to, and to observe/record cloud cover in the signal direction.... since this is a professional use, they must be "pro" cameras.
And yes, I have used a GoPro to record information in field trials.... once again, since it is a professional use, it must be a "pro" camera, and it is one of two pieces of kit that I have that have "pro" in the name. (The other is a 3/4 inch drive socket set)
Get the point? A pro will use whatever the appropriate tool is to get the required job done and not get hung up on some designation by people on the internet.