Well if it is group 3, they are being used, only in theory if you have a group 4 or 5 base would they possibly not be used. HTHS is a hint if they are being used, but the atsm's don't have deep enough tests to tell. A voa and then a uoa on a long run would be a good look if there is VII's. Also, anything testing fresh oils seizure rate or when an oils siezes can be a good look at well. Just like VII's are branch chain, so is Prolong engine treatment, when the chain is locked, it is very hard to make the metal seize. However, in that case it is actually chlorinated, so widely accepted that is dangerous to an engines in real terms of risk, VII's not as much. Chlorinated Paraffins can be made in many types of branched chain, from short to long, VII's can also be made with different characteristics.
Oil is not polar and has no chains branched or other. The base oil lubricates by density. Esters are loosely polar and very dense, and thus why they lubricate so much more effectively. But they also are not branch chained in the same sense, the bond is weak in those terms, so in a sense if they find a way to make a branch chain that self heals, they will likely be better then esters but only if we are talking about the same exact viscosity.