I can back this up. I’ve used this method on several setups for at least a couple of years now and it has worked beautifully. It even worked to improve a setup that I received warped. And they’re stored in a ground level, not usually air conditioned room, subject to temperature and humidity fluctuations.
The people who dismiss this method as being too many hoops to jump through are nuts. Put them in their box face up, add a cut card (which should be there anyway) and a dealer button and then the cover. Simple.