Hi Jonathan. Sorry for the very slow response. That's not my review, but my attorney has written him a cease and desist letter.
I have a thermometer like that in my keggle. but it hasn't caused any problems. I'm not looking at it right now, but it has a much shorter probe than the one shown on NB and it hasn't cause a problem. Truth is, I rarely look at it. I hang a long (10") k-type thermocouple over the side of the keg to monitor and control the temperature. It's attached to a digital controller. I got both of these from eBay. I'm electric, so the controller drives a couple of solid state relays. This combination is much more accurate than the dial thermometer, although it does look kind of cool.
FTR, I'm pretty sure this is the one I have: https://www.morebeer.com/products/fermentap-dial-thermometer-3-face-25-probe.html
It only has a 2 1/2" probe length. NB doesn't specify length, but it looks longer.