I wondered the same and I sincerely hope so, for this supplement it would not be that difficult, just add Bullgryns and some fluff blurbs along the ways "it was Astra Militarium all along" (or as I like to put it "Astra Militarium without, Imperial Guard within")
On the matter of Taurox I disagree with the statement it is completely silly. There are some poor design choices, for example why couldnt it be a wheeled vehicle or halftrack, the "doubletrack" is rather weird. It has also too high profile for my liking, often emphasized by the add-don turret (the non stormie one without the turret in cadian colours looks much better). But the concept is sound, we have yet to see artwork of Taurox which could do it in-universe justice and nobody is forcing the GMs to describe it in much cooler way. Difference between the models and storytelling of orks comes to mind.
There is nothing as good as seeing rebel scum running out of a cave full of gas, right into the blasters of your battalion-–well, except sunrises, but for those you have to get up early.