I don't think it's a pathway to actually reducing emissions in any significant way, other than by imposing undue costs on small businesses and having enough of them shut down.
The fact is that when businesses were consulted about this, a lot of small businesses said this was not something that should apply to them. Of course, the consultants who would be in charge of making those reports are typically very much in favour of getting extra business.
In and of itself, voluntary disclosure of the different scopes of emission is not a bad thing at all. It can be a good thing, and that's why some businesses choose to do it, but mandatory disclosure would be very, very costly for the many small businesses that would be subject to it or that would be in the supply chains of other businesses that are subject to it.