I suggest no decals means no decals. The instruction books are presumably just reprints of previous editions and they have omitted changing artwork to keep pricing down.
With today's announcement about CoVid19 causing delays to the new kits, (and decals printed in Italy,) perhaps they are releasing these kits to use up stocks of plastic bits to keep cashflow going.
BTW Hannants have these on future release at 58.99GBP, interestingly no discount for pre-order (as yet anyway.)