Yes, it is very odd to post a letter from your own lawyers which states your lawsuit stands no chance, in a forum that can easily be read by the other party.What I find questionable is that whomever paid for the Seham opinion permitted the OP to post it publicly. Generally, when I write legal opinions, my clients are in no hurry to publish them on an internet board. Gotta wonder if it was published by the OP with permission of the group?
But, that is USA320pilot. He truly seems to think the East position is legally sound, so maybe he doesn't even realize some of the things he posts and the cases he refers to actually hurts their cause even more.