So prior to Oathbringer coming out, I had done as much research as could be done (which admittedly wasn't a lot) on Voidbinding, and came across this post on the forums:
Number 4 on jofwu's post points something out - on the drawing of Kharbranth in the first book, the symbol that corresponds to the Dustbringers on the Voidbinding chart is seen in the corners.
A bit odd, no?
However, we know from Renarin that the spren he bound to still gave access to similar surges as the order that it claimed he belonged to. He had powers similar to Progression, after all. We also know that the Fused could simulate the Lashings as well, though there were differences (possibly due to it being a different sort of Bond - Renarin may have been Nahel-bonded to a corrupted spren of the appropriate type to make a Lightweaver, OR may be a Voidbinder, and the fused are something else- or the two are one and the same, just through different species).
So, we know that corrupted spren can simulate the Orders of the Radiants; we also know that they can trick the pseudo-Knight into thinking that they are Knights of that order. Without any original Knights to compare to, who would know (outside of the Skybreakers)?
So. Theory-time. If the act of a human binding a Voidspren in a Nahel bond is, in fact, Voidbinding, then it is possible that Taravangian's Dustbringer, Malata, isn't a true Dustbringer. She's a Voidbound Dustbringer.
Keep in mind - Taravangian did everything he could to find a Knight to carry out the Diagram. And he was amazed that he found a member of the ONE ORDER that he felt would be most in line with his view. How convenient.
If that is the case of course, then the confusion between Dustbringers and Voidbringers becomes a bit of a joke, I think, but I'm fine with that.