Yes I feel sure that at some time the spec has changed, Jan 2016, when I ordered mine (Vel Exec with loads of extras) and became a total expert(ish) on it all(most of which I have now forgotten)
, I feel sure that both the SE, EXEC, and Gen SIX, came with a 20mm drop if you specked up DCC. At some time it has changed, so if my theroy is correct, the Older Gen SIX Vels will have the 20mm drop, but the newer ones won't. But honestly you cannot tell with VW, they can alter specs at any time without prior notification (not just model year changes), and also if they ran out of short springs, they should could put standard springs on, and deal with it later. Who Knows what goes on in Wolfsburg, or where ever they are made.