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They claim that it may not hold up in court if tested, or similar. First, this doesn't seem to be true, the GPL has been found valid in several countries (and to my knowledge, it has never been found to be invalid). Generally, courts take contracts (and thus licenses) very seriously.
It all depends on the country. In Spain for example, adhesion contracts are not legally-valid. You can sign whatever contract you want, but you have the right to discuse all the clauses one by one with the entity you have signed untill satisfied. If this is not possible like this case, the contract could be not valid against a judge.
Perhaps the solution is to release the GPL plugins in Spain ;).