You can't tell from videos what your eyes will actually see in practice. The human eye works in vastly different ways to a video camera, and has far more flexibility in dealing with things like refresh rates, resolutions, brightness and color balance.
The only way to know is to actually sit and use the system and see what happens. And it won't take 14 days to experience the problem if it is something that will impact you.
For example, I can use my iPhone to create a video of my 13-inch MBA which shows it flickering, simply because the phone's refresh rate isn't synched to the screen's. The video looks fairly bad, but I don't actually see it at all in real life, and have used the machine for 3 years.
This post is old, but I think this merits a reply.
Those videos tell you EXACTLY what your eye is seeing. The video just makes it easier for your to comprehend it, since you cannot "see it" in real time, but your biology IS experiencing it in real time. Your eye is seeing a light being turned on and off many times per second.
This is a way of managing display brightness. Depending on how bright the display is, the frequency of the flicker is either faster or slower.
This is called PWM.
There are websites that have lists of laptops that do not use PWM for brightness adjustments SPECIFICALLY because PWM has been long-known to cause issues as many people are sensitive to it. I always tell people who are sensitive to PWM to avoid Apple Laptops unless they will be using them with an external display that does not use PWM for brightness adjustments. There is no setting that will allow these displays to work for them. This is a design of the hardware. Many PC Laptops also work this way.
Smartphone and Tablet displays also often work this way.
I know people who "suffered with migraines" for years that went away when they got rid of their iMac. I was one of them. I walked around indoors with sunshades on because that display wrecked havoc on my eyes. I always had a headache from using it. I didn't realize the iMac was causing it until I stopped using it.
I do have an M1 Pro MBP, but I don't use it unless it's connected to an external display because of this issue. After using it for three days, I became somewhat farsighted, so my focusing distance became much longer than it was before using the laptop (can't focus as well up close, have to pull things back to read them, etc.).
IMO, there should be some sort of warning on electronics that use PWM, as the effects are scientifically and medically verified and proven... and they are harmful to many people.
Why does this happen?
Because the human eye manages how much light it lets in by dilating or constricting your pupils (this is the fundamental that camera lenses are designed around). If the display is flashing on and off, and your eyes see the dim flashes, it will dilate your pupils and then the bright flashes will lazer into your dilated pupils. Pupils usually constrict for bright lights, but it's more typical that humans experience gradual brightening of lights in the real world, not 60-120 0-to-300 nit flashes per second.
In effect, this is like looking at the sun on a bright day, and over extended periods of time, it can damage your eyes.
This has been an issue with PC monitors for many, MANY years. Every iMac that I've used since at least 2012/2013 has had this issue, and most MacBooks that I've used have had this issue.
I had to buy a specific brand and model of PC Laptop to avoid this issue (to have an actual laptop that I could use in a mobile scenario).
It's not about the reflections. It's about the NITS that the screen is outputting in those flashes, and the way the display panel manages brightness. I can put a blanket over me and the laptop and use it at 40% brightness in complete darkness, and it will still do this to me because that is simply how the technology functions. No setting will change that. The only workaround is using it with an external display that doesn't utilize PWM... Literally... that's the ONLY workaround. Everything else is placebo, 100%.
