Re:Washington state lawmakers approve human corpse composting
by jalk on Wednesday May 22, 2019 @05:24PM
(#19985683)
Jessica Mitford book "The American Way of Death" from 1963 is describe here
https://www.laphamsquarterly.org/death/fond-farewells
She documented the undertakers bumping up the prices as you describe (to put it mildly).
I don't however know if the undertaker lobby has since managed to get embalmment mandatory / carteling with the graveyards
You're really going to have to provide a citation for that.
On our way to choosing a natural eco-friendly burial, we looked at quite a few locations. There was one common feature - none allowed embalming. Nor is there any legal requirement for embalming, and very few (regular) burial grounds require it. It's a convenience for undertakers (and a nice way to bump the price implying it's an expected procedure).
It seems very unlikely that would be the case if your assertion were true.