Honestly? Pretty skeptical, since when I built a transparent monitor myself last year, I made extensive tests with using reflective surfaces like a mirror etc., so that I could use it away from a window, hence, I know exactly what this advertised screen is trying to accomplish. The results of my test were modest to say the least.
In the Reddit thread where this was announced I and others listed reasons why this doesn't work that well away from a window and I even posted many pictures of my self-built screen with the mirror showcasing how something like this actually looks in the real world. Something that this company so far has failed to do. When people ask for pictures and videos, you are just promised to be sent images of a prototype if you write them an email, which seems rather dubious to say the least.
Lastly, I also want comment here on the alleged health claims that this is comparable to eink monitors in terms of comfort. Since the reflector behind it will never give you even lighting through just ambient lighting (I know, since I extensively tested this, see my pictures for proof) you will very likely get mild eyestrain and headaches at the least (I did), which isn't the case when I look at an eink monitor.
Of course, you can just use it in front of a window, and then a transparent screen like this will actually look pretty nice! And you have the benefit that you are not affected by PWM, since obviously sun/daylight is a constant uninterrupted source of light. However, you will need to pull the blinds down until everything except the screen is covered, because the contrast difference between the screen and the rest of the window can cause eyestrain and I believe that would probably also be the case for people who do not have the eye issues that we on this forum have.
The final drawback is that you can only use that monitor when before the sun starts to set.
I would love to be proven wrong though, but all signs point to this using one of the regular LCD panel types and I tested all of them for the viability of this idea and all of them were too dark for them to work well in ambient lighting settings and as long as I see no real pictures and videos of this thing, I will remain skeptical.