It is not a surprise. The rules were clearly mentioned by the European regulator:
The 4th Anti-Money Laundering directive adopted on 20 May 2015 raised the objective to fight against tax avoidance among the European member states.
On February 17th, the CSSF issued its circular 17/650 drawn up with the Financial Intelligence Unit which provide guidance on the implementation of the 2017 tax reform in Luxembourg. This is an overview of the new AML-tax related requirements imposed on the regulated professionals.