But, if they don`t apply the EU law now, Poland will have to pay fines.
Polish law trumps EU law de facto each and every time. A law, fine, etc. means nothing when it can't be enforced. Just look at the whole bogus article 7 procedures or when they tried to strip Poland of EU funds because we didn't want a flood of third worlders or even the situation in Crimea. Yeah, on the books de jure Crimea belongs to Ukraine, de facto and in reality in belongs to Russia.
The EU is all bark and no bite. PiS realized that a long time ago and that's why they can keep doing what they're doing, all while remaining the most popular party in Poland.
But, if they don`t apply the EU law now, Poland will have to pay fines.
Sure, even if that happens big deal a few million in fines for the EU to give Poland billions in funding. A good trade imo. As the saying goes, gotta spend money to make money...