They're not saying: Don't bid it.
The Union IS saying:
"With management invoking their vision of 4.A.2.b., it is not certain, but quite possible that during the interim, the international MD-11 flying may pay significantly more than the B-777 due to line construction.

With the closing of the B-777 bid on Monday, care should be taken in any decision regarding this posting. This caution is in no way intended to dissuade any pilot from bidding the B-777, but rather to fully disclose the remaining uncertainties that we feel are critical for you to make decisions."

Like the previous post sums it up--Buyer Beware!
Or in other terms--Be carefull what you ask for, you just might get it!!!