ECR is a very mixed bag of right wing populists, libertarians, National Conservatives and mainstream Conservatives like the Tories and Fianna Fail. You can not deduce anything about ANEL from their membership of this apart from the party being right wing and not Neo-Nazi.
It stretches from Fianna Fail and Tories over AfD, DPP/True Finns in Scandinavia to Croatian Party of Rights dr. Ante Starčević.
To be pedantic, Fianna Fáil
the party is still in ALDE. It's just that its only MEP fell out with ALDE and jumped to ECR, much to the displeasure of a national leadership which is trying to position itself domestically as being centre-left (or at least to the left of FG).