This is akin to States in United States losing sovereignty to the United States Federal government. It is a balancing act between the two, and calling the USA (or the specific States) therefore not sovereign isn't about curiosity; it is intellectually dishonest. Surely you can do better if you want a discussion where curiosity reigns.

> [...] and in fine sovereignty, to the EU from member states [...]

This no longer works if NATO doesn't exist or if those member states get under military pressure by either Russia or the United States.

The narrative you mention is spread by alt-right trolls in order to lower the power the EU has. It is called divide and conquer.