That link says to me that they are getting tougher on people rather than new laws. Its only highlighting what is already done with regard to wiring (visual checks?), body tyre clearance, blacked out windows etc.

The biggest problem is the engine mods, may just mean that parts have to be TuV approved may be? But how will they check your pistons for example?

ECU's? They will never sort that as I can put mine to standard before an MoT if needed.
Aftermarket management is safe from what that says as there is nothing on it.
More about manufacturers getting an arse on with people breaking into the ECU or what ever its called.