"3D sound" is one of those made-up buzzwords often used by people who want to feel good after purchasing analog signal processing effects or synth instruments. Sometimes it's used by marketing people in the pro audio to sell you more gear. A fool and his money are soon parted after all.
Thus the term "3D sound" is a mere fabrication, much like the term "warm". There is nothing scientific about it. As a result, another dude could also say their compressor makes the audio material sound 4D, and who is going to argue with them? However, I do think it's opinionated mumbo jumbo.