It's late (in BC, Canada anyhow) so I haven't checked the threads you mention; excuse me if I repeat everything that's there.
My understanding is that scavo is intended to replicate the effect created in glass that has been in the ground some time (old Roman glass found by archaelogists). (I think that scavo means something to do with digging in Italian.) According to the techniques described on the Loschs site, "scavo is created when the hot surface of a vessel is treated with ash, metal salts or fine sand." A residue is left on the surface of the glass. Corroso is "where acid is placed on the finished surface of the vessel to create a corroded surface."
Those descriptions certainly fit the glass I've got. I have a blue scavo vase marked "Cenedese" that is matte and has dirty black streaks. I also have what I think is a Seguso corroso bowl (with a Saks 5th Avenue label). Clearly, the acid has dissolved the surface of the glass to different extents at different points. I think I remember reading that corroso could also involve waxing parts of the vase to accentuate the effect.
I've also seen scavo being used by modern studio artists, Rik Allen in the States for one. His scavo leaves the glass with a pitted effect, which looks quite different from Murano scavo. If he didn't name it scavo, I'd think it was a form of corroso. This is also true of another couple of artists' work I've seen.
Your glass looks like scavo to me, although I' can't be totally certain just from looking at the pictures. I can't remember ever seeing scavo in those colours or shapes.