It was probably correct as the AE tables in Doug's post were used for later Roman bronzes, but earlier ones used the actual size in millimeters i.e. AE26 or AE28.
There are two different and conflicting standards here. Greek coins are numbered by diameter in millimeters. Late Roman coins were forced into those four size ranges with AE1 being largest and AE4 smallest as explained on my page linked above. As I said there, this is not a problem because there are no Greek bronze coins under 5mm so you know that AE4 and below are Romans and anything higher has to be a millimeter measurement. AE28 is a bronze coin 28mm in diameter. Should we be using one standard for both? Certainly but try to tell these scholars that they have to do something just because some other scholar did it that way in another book. At least no one is using some of the old arbitrary systems like the Mionnet scale anymore. https://www.forumancientcoins.com/monetaromana/corrisp/mionnet.html
ohh that makes a lot more sense. SO which one should I use? Cm or mm? I feel like cm may be better. This is another one (and another timber table ;}) I cant figure which type it is because look at the thing to the bottom right of the ?Victory?
Nice coin especially the obverse, and your table, I think you should measure and label in millimeters as you won't see any 2.8cm or 2.6cm anywhere.