How do we separate the debunked ether from a spacetime medium that facilitates waves? 006 is suggesting acoustic transmission which also suggests a substance - normally acoustic means compression waves I think.
As I said to you before, Einstein originally said one could think of his spacetime as a sort of immaterial aether. But, as I also pointed out, the whole aether idea was dropped as it is not needed and in fact immediately raises all the awkward problems of motion relative to it, whatever it is.
If you want to regard spacetime as a sort of aether, I think you are free to do so, provided you make clear to anyone else that that is all you are doing. Aether cranks are two a penny on science forums and if you give the impression you might be one of those you will be asking for trouble.
Yes acoustic waves are compression waves. I would however be careful with the ideas of Dubblesox (real name Gareth Meredith). He is by his own admission on the autistic spectrum, he can't do maths, even though he has a hobby of posting screeds of it without explanation, and he reacts very badly to criticism. He's been doing this for years and is banned from just about every science forum on the internet except this one, so far as I can tell. I've had him on Ignore for a long time now (along with a number of the cranks and nutcases on this site). You may find it interesting to discuss things with him, but just be aware that you may not be getting established science from him.