This is an important distinction, IMO, because I have seen people saying that this is an important step because "insurance/patients can now negotiate easier with a set price list". The issue with this is that, like mentioned above, the public has already had access to these price lists, so this new rule changes nothing in that regard.
The new rule might make it easier for insurance companies or those collecting pricing information to scrape the price data from the hospitals' websites, which is a good thing, but overall I think this new rule is being overblown in terms of the actual impact it will have.