The member states care about America's friendship and cooperation on many things. You have to follow the power to see what the results will be.
Personally, I think he's just doing it to have a record for posterity once it's rejected, to turn common knowledge about EU-USA corrupting power relationships into public knowledge (although I don't share his hope that this will ever become public knowledge - but then again it takes an idealist to fight these kinds of battles).
The courts deciding against his argument would only be probative on the question of corruption if you start from the presumption that his position is correct. Your post is entirely circular in its reasoning.
Personally, I think he's just doing it to have a record for posterity once it's rejected, to turn common knowledge about EU-USA corrupting power relationships into public knowledge (although I don't share his hope that this will ever become public knowledge - but then again it takes an idealist to fight these kinds of battles).