These are reasons why it might not be the largest provider of funds per capita, not why it would be by orders of magnitude the biggest recipient.

I have been to Luxembourg and to Hungary, Bulgaria & Greece - the otherwise obvious contenders for "poorest" in the EU and Luxembourg should not be in the picture.

If it gets funds for restoring one railway bridge or something of that sort the fact the population is tiny makes the per capita investment look huge, just usual tiny country effects.