I'm glad I got my hands on one, but I haven't had a camera for a while now, so I wasn't sure what to make of this overpriced lens protection filter. So, I artificially created a ghost in my room and took a photo. Then...
I couldn't really tell during the shooting, but when I looked at the image file, the difference was obvious. Compared to the product made by M, this product also has ghosts, but there is a clear difference in the reduction in contrast around the ghosts. (I hope you can see the difference in the images shown in the review)
By the way, the product of M, a major filter company, is also a protective filter and costs 1,924 yen. (Purchased in 2018)
This product has about 10 times the magnification, but for example, if you are using a 300,000 yen F2.8 zoom, the extra 20,000 yen for the filter is well worth the improvement in image quality. (Sorry for the mess on my desk)

test data
Camera CANON EOS R6
Lens CANON EF 24-105 L
Shutter speed 1/6
Aperture F4.0
Focal length 24mm
Backlit light source LED stand
A tripod is used, and the focus, shooting angle, etc. are all the same for both shots.