I don't think they're impossible by any means. I don't even think you need to be good to beat them, you just need to be stupidly patient and not mind trial and error.
I see only 1 attempt made by you on one of my levels. I don't really understand how you can make such broad statements without heaving played more levels.
The difficulty of a level is very subjective, as some might find them hard while others might find the levels rather easy, but objectively speaking out the 4000+ published levels, these 6 are currently the only ones without a win. Like I said in my original post, I am sure that there are quite a number of forum posters that can get wins of them.
That said, if you think the average player can beat them with some patience, why don't you give it a try? :)
I'd be surprised if the OP could actually beat most of the people that have posted in this thread at multiplayer warlight.
I can assure you that I would get beaten all the time by all posters! But what does multiplayer have to do in all of this? I never claimed to be good at mp, not even at sp if that even counts for something.