Harry, that is indeed interesting. A problem I have always had, is keeping the iron square to the holder. This jig sorts that out. Somewhere on Youtube I saw a guide to improving the Eclipse-type holder in your images. Now if it would only hold bevel chisels flat - mine used to twist around, and get unintended cambers.
I bought the Lee Valley sharpening system some years ago, and got very poor results - the blade was supposed to be automatically squared by the apparatus, but wasn’t, and the hold-down thumbscrew did not keep it fixed in position, if one adjusted it manually.
Shortly thereafter, they brought out the Mk II, which Stick praises. Just my luck.