In Ireland its still theoretically an option (as in there is an end-of-school exam one can take in the subject) however its only available in a tiny handful of schools nowadays.
It was more widespread in the first half of the last century.
That doesn't mean a whole lot. If one school in the country offers an elective, is the country highlighted? Certainly we didn't have widespread classes in ancient anything.
This is just plain wrong on Finlands part. I'm a native, and I have NEVER heard of ancient (or modern) greek as taught at all or even as an elective. Few niche university programs in a couple of uni's do offer that though, but in elementary or secondary school... Just plain untrue.