I get that there's a limit to what they can do / say because ultimately this is branded content, but I do find this video kind of boring...I found this Canon 7D torture test back in 2012 way more engaging as an example of this kind of video because there was a sense of progression of attacks, the stunts were more outrageous, and after each trial there were check-ins to see how the camera was actually faring.https://www.youtube.com/watch?v=RCT-YMgjm9k
Make sure you have the talent look at their main eyeline, sometimes talent will get distracted while idling in front of the camera while the crew is busy preparing.
Sometimes people get more expressive during the actual interviews/performances than when they're just blocking/rehearsing, which can lead to more head movement or looking around. If you thought you were safe, be aware that that can change and you could still get hits of reflections that are hopefully momentary and not a big deal.
Also thinking laterally, you may find yourself in environments with practical lighting that you cannot directly control and end up causing problems e.g. overheads in a store. Options in this case might be blocking the lights with a flag, throwing a diffusion frame in there to diffuse individual light sources into a more abstract and less offensive shape, changing your orientation in the space, or probably at worst asking the talent to modify their movement or adjust the position of the glasses on their face. Making asks of talent is the least ideal because of course you don't want to interfere with their performance, especially when dealing with non-actors who are already feeling very self-conscious and uncomfortable.
Not all reflections are bad either, depending on context and style. But ones that obscure your talent's pupils+iris are usually killer.