And if you read literally one paragraph from the bit that you quoted:

"The majority of national courts have generally recognized and accepted this principle, except for the part where European law outranks a member state's constitution. As a result, national constitutional courts have also reserved the right to review the conformity of EU law with national constitutional law"

And guess why and how they are able to do that - that's right, by retaining full sovereignty of their own justice systems. Even obeying rulings of the ECHR is purely a matter of courtesy more than anything, as neither EU nor ECHR have any enforcement mechanism beyond withholding funding, as many EU member states have proven time and time and time again.