Hogwash! The 2018s absolutely do support coding. There was a change in the coding structure starting with 2017, in which all long coding was moved into adaptation channels. So there's no more "long coding". But it's still all there in adaptation channels and works just fine.
Could it be that your VCDS interface needs updating to remain compatible with the newer BCMs? I know Ross-Tech has to issue updates, or upgrades, occasionally to maintain compatibility.
Who knows... I certainly don't. All I know is the coding that works for everybody with an early Mk7, doesn't work for my 2018. I'm just repeating what Uwe Ross posted in that linked thread. He's the kingpin of VCDS, so to me, his word is bond. There's gotta be additional settings in the "long coding", which according to you is now within Adaptations, cause something is missing.
As far as I know, VCDS interface is up to date, and I can access everything else in the 09 module, minus coding which sounds normal for Mk7.5's...