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Did they actually not control for U.K.? They just subtracted the 6th biggest economy and ran a sensational headline?

The UK was never in the Eurozone.

This is about the European Union, of which the UK was a part, not the Eurozone (where they use the Euro as currency).

The chart in the linked tweet labels it Eurozone.[0]

But the title and tweet do NOT label it Eurozone. They label it EU.

That rather makes it poor communication, no?

They did. Perhaps GP was referring to the economic impact of the decoupling.