Typically, a pipe band played at full volume peaks at 111 decibels outdoors, roughly equivalent to the sound in a nightclub, rising to 116 decibels indoors, the level of a chainsaw.
The rules cap weekly average noise exposure at 85 decibels, meaning periods of loud play need to be cancelled out by quiet periods.

The idea is not to protect audiences at concerts but performers and other staff.
This is an article similar to the sort written in the UK by anti-EU pulp/sensationalist "journalists".
If the article is accurate and a fair reflection of the legislation, and I very much doubt it is, peak volumes are still not the same as average volumes, and the "journalist" also attempted to gloss over the fact that this is intended to protect the hearing of nightclub workers etc.
I reckon the only pipers this will actually affect will be the ones who accidentally superglued the pipe to their mouth and have to play it 24-7, whereas it could protect the hearing of an awful lot of performers & staff.