Why is selling Adblue emulator not illegal?

Interesting that the TC office did not make any reference to any laws broken.

Maybe it is as I suggested, that there are no actual laws being broken. ?
But simply disabling adblue is a policy infringment of the TC and DVSA etc.

If it is considered a competitive advantage ( and thus not allowed ) to disable adblue then is it a competitive advantage to run a Scania or MAN truck ( most of which do not have adblue ) or even an older Euro 3 truck ?

Does this publication mean it is perfectly legal to disable adblue on a private car or van ( which O licence does not apply ) as the TC does not have any power over the driver / owner ?