This doesn't seem accurate, it says that Greece uses 0% coal when I know that at least 660 MW come from coal.
You can view averages from the past 30 days, 12 months, and 6 years though and that shows the percentage of coal generation being about 800MW over the past 12 months.
https://en.wikipedia.org/wiki/List_of_power_stations_in_Gree...
EDIT: It doesn't seem like the specific unit is on the list, it's called Ptolemaida 5.
https://en.m.wikipedia.org/wiki/Agios_Dimitrios_Power_Statio...
They just use terms like “thermal” and “lignite” (brown coal) to make it sound nicer.
I guess depends a lot on public sources.