[Brightcolours]

That's not true. Look at the lens parameters of the Canon 70-200's (2.8 vs 2.8 IS and 4 vs 4 IS) and you'll see that the number of elements is higher on the IS lenses. I think that you're looking at some lenses that are produced at the same time in 2 flavours like the NIkon AF-P 18-55 VR and non-VR (or the AF-P 70-300 VR and non-VR). Those are exactly the same but the VR ones have extra components to let the VR elements move. The non-VR lenses have the VR-elements fixed.

The same trick has been done many times before with stabilised Sigma and Tamron lenses that are made for Pentax and Sony (or Pentax lenses that are rehoused Tamron lenses). They just fixed the stabilising elements of these lenses.

You are confusing new versus old. 

In your theory, the Sigma 50mm f1.4 Art has IS and the old Sigma 50mm f1.4 DG HSM does not have IS.