As far as I can make out, what Condate wants to see is the EU disappearing completely, and all 28 member states to simply exist in isolation from one another, with no framework for collective action or collective agreements - on trade, the environment, on climate change, on international development or global security or anything else.
Let's just take the last issue. Two years ago the EU introduced sanctions against Russia, after Russia's illegal invasion of Crimea and other military activity in Eastern Ukraine. The effect of those sanctions has been severe, and Russia's exports to the EU have since fallen by about half. So acting together, the EU, with its population of c. 500 million, (greater than Russia and the USA combined), can be really powerful. We have stood up to Putin in a way that no individual European country could ever have done. That's why Russia is so keen on Brexit, of course.
Politically the EU has been a huge force for good. For example it provided the incentive for Spain , Portugal and Greece to change from being dictatorships to being democratic. And when the Iron Curtain came down, it absorbed many of the former Soviet bloc countries and fostered democracy in them too.
If it didn't exist, we might not create it. And there is a lot wrong with it. But it does exist, and we would be mad to let it fall apart.