Zaporizhzhia is the largest nuclear power plant in Europe, with six 950 MW reactors for 5700 MW nameplate capacity. It remains to be seen if it will ever reach that capacity again (and in which country).

Whereas

The Olkiluoto plant consists of two boiling water reactors (BWRs), each with a capacity of 890 MW, and one EPR type reactor (unit 3) with a capacity of 1,600 MW.[1] This makes unit 3 currently the most powerful nuclear power plant unit in Europe

... i.e. it's the headline that's wrong : the EPR is the most powerful nuclear reactor in Europe.
The plant, at 3290 MW for its 3 reactors, is far from being the biggest nuclear power plant in Europe. I have never seen a nuclear reactor called a "nuclear power plant unit" before. Where do they get these journalists.

In France, Gravelines (practically in Belgium), Paluel (in Normandy) and Cattenom (practically in Luxemburg) have a higher nameplate capacity, at 5200 MW, than the Finnish plant. I have worked at all three. Oh, and there a bunch of other French plants at about 3600 MW, most of which I have also been to. So Olkiluoto comes in 11th in Europe.

Given the current problems of corrosion under constraint which have contributed about as much as the Russian gas crisis to the explosion of electricity prices in Europe, one reactor at Cattenom and two at Gravelines are currently under maintenance. But in terms of current production, Cattenom is the top in Europe, at about 3600 MW.

_{It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II}