Despite all the FUD about health care prices, most states have consumer protection laws that require providers/hospitals to provide estimates for services upon request. Therefore, by law (state by state) the hospitals could not employ the tactic you suggest.
I know this off hand, and don’t have the time but from there you could probably find a few websites that will reference comparable laws for each state, if they exist.
https://www.pcpcc.org/resource/report-card-state-price-trans...
This is just what I could find quickly. There might be better resources on these laws.
Law is an unforgiving beast so you would always want to refer to the source law they cite, and finding case law (much more difficult task) which references said Law and see how it’s applied/interpreted in practice.
What you linked is certainly much more practical for educational/informational purposes.