My problem is that this article is polarizing the discussion.
By leaving out the core of anti GMO concerns it lets the pro GMO people feel justified in their position. But the other side will not see their concerns addressed, and will discard the article as stupid, and missing the point, feeling equally justified in their position.
To (1) actually the eu merely regulates GMOs, and by default they are not allowed. Today 51 GMO products are allowed, including 1 that has a herbicide (mon810). I would hope that the strictness of checking and data would depend on a case by case basis.
(2) for me is not a concern. In the wild GMOs will not do better than non GMOs, probably even worse, because the traits added by GMO do cost the plant. It is not like we can create zombie maize. But of course, we do need to apply caution. Think about Australia where foreign plants do become pests pushing existing plants out of the ecosystem.