Creative Poland's text seems to confuse a lot of issues
They basically reiterate an argument from the discussions around exhaustion in the single market, but my feeling is they have it backwards.
"Exhaustion" means that you may trade the legal copy of work that has been published by or with the consent of the creator. This applies to the whole single European market, i.e. if you as the creator produce and sell a CD in Poland, it may be sold all over Europe.
When single market exhaustion was introduced, there was an argument that this would have required local artists to raise their prices because now they had to consider distribution over a wider territory with widely varying prices. Their license fee would therefore tend to approach a higher average. Thus local culture (with general lower prices) would have become more expensive and therefore priced out of the market altogether.
My cursory search did not turn up any source that confirms that this ever happened. And they ignore that single market exhaustion is already there so that ship has sailed anyway.