I don't have a direct experience but from what i have read, no, it is not subspace because your descriptions are so different from what others describe, and because you sound so neutral and detached. No "ahh subspace" but "whatever it is as if I were watching a movie and not participating and I do not care".

I do not know exactly what it is but it starts with the letter D. Derealization, dissociation, detaching from experience - one of those.