The electronic shel labels use e-ink. Their refresh time is around 30 seconds. What happens if two shoppers are looking at the same product?

Since you get a location and time stamped receipt these shenanigans would be completely trivial to detect.

It’s hard to talk about without sounding conspiratorial because it literally is an unfounded conspiracy. The impracticalities of this scheme are immediately obvious and no evidence of it ever actually being implemented in physical retail exists.