> The EU is not about unity but rather about modern day colonialism.

What does this mean?

It doesn't mean absolutely anything.

It means the central countries in the EU (Germany, France, Netherlands, Scandinavia) are mining the peripheral countries for resources and cheap labour, and placing them in a situation of permanent indebtedness, so they effectively become colonial outposts of Brussels.

France might have some imperial/colonial intentions, rest of Europe is actively fighting against neocolonialism by supporting Ukraine against Russian imperialism.

Spain and Italy are also have active deployments in the Sahel and Maghreb.

The Sahel Refugee Crisis has had a massive impact in Spain, Italy, and France and all 3 countries have institutional memory of the internal blowback caused by the Algerian Civil War in the 1990s.

This is arrant nonsense. EU countries are NOT busy dominating each other nor are they engaged in colonialism, unless you think the Brussels Effect is about colonialism instead of the EU punching above its weight in setting norms and standards.

The EU is actually a very effective mechanism for preventing countries dominating others. A current case in point is the EU acting as a restraint on the historic domination of Ireland by the UK.

The UK expected Ireland to be forced out of the EU following the UK's exit or that the EU would sacrifice Ireland (compel it to have a trade border with the EU in order to protect the status quo of the open Ireland/NI border). Neither happened. Instead the British were obliged to uphold the Belfast (Good Friday) Agreement -- a change from the UK's customary bad faith in dealing with Ireland.

Very simply the UK couldn't and cannot afford sanctions the EU would impose if the UK repeated its colonialist behaviour.

You'd be better off reading up on how the EU came into existence and on how it actually works (why VAT for tax eg) than making unsupported assertions.