I was going to add that if it is indeed true, the virus is new and as time passes we know more and more about it. At the start very little is known so best practice guidelines may have been followed. As more data and knowledge are available, updated guidelines may be needed.Unless it's on a CDC website, be careful what you believe.
One of the worst things about this crisis is the dissemination of false info.
This is why we should be happy when the guidelines change: it shows us that knowledge about this new thing is growing.