Interesting way to dump the black tank

I saw a motorhome a couple weeks ago, apparently from the 1970s/1980s, that had an interesting way to dispose of black tank contents. It had a thermister in the exhaust pipe, and would slowly spray contents from the tanks into the exhaust stream if the gases were hot enough, effectively incinerating the contents. I think it was made by Dometic.

Anyone hear about a system like this made today, or is this something that is a relic of bygone days?