Is the light test on ds games debunked?

I was on another sub Reddit and mentioned the light test for soul, silver, and got banned from the other sub Reddit because they said that was a debunked method. I was not aware of this. I currently produce reproductions and label them as such, but I have not come across any that have matched Nintendo’s transparency shell.

So my question is is the test really debunked and have other scam companies managed to actually copy that shell?