Something like this to produce graded readers is a great idea, but I don’t see anything in the ad itself that indicates it’s for language learners. If this is for a general audience for native speakers, then it’s enabling people to avoid learning to read (and ultimately use) more complex and nuanced language, in favor of infantilizing consumers and spoon feeding them everything.

The only use case I could see this being a positive for when aimed at native speakers would be something like adult literacy programs, or maybe homeschooling for kids with difficulties learning to read who don’t have the trained, professional support that one would hope they might have in a more typical school setting. For adults who struggle with illiteracy, I could see this being quite beneficial, though. It’s something that people will often be embarrassed about to begin with, and somebody who’s feeling self-conscious about this could be demotivated by only being able to read books aimed at children. Even if they say “Screw it, I need to do this,” it can be difficult to maintain motivation and interest when the only content you can find at your reading level is written for little kids. If they could have adult materials adapted to a level that’s challenging but manageable for them, I could certainly see that being a good thing.