No, the quotes do not say that. They say the opposite of what you are claiming. I will inspect them and explain closely, although that is unnecessary because the devs spelled it out immediately in the official discussion thread.
Quote1:
This set switches Wind Stance and Tempest III to doublestrike bonuses, increases the benefits of the TWF feat chain...
The statement says that Wind stance and Tempest3 become doublestrike. It gives no information as to the interaction between doublestrike and TWF. The second part of the statement says that the TWF feat is being increased, which again has no relationship to either doublestrike or the first part of the sentence (except that the change happened at the same time.
Quote2:
Off hand attacks now have a chance to proc (trigger) off of any main hand attacks based on the number of two weapon fighting feats (and related enhancements) you possess. (Instead of being predetermined on certain attacks in the attack chain.)
This is where you make the big mistake, which is classified as a quaternio terminorum error. The word "attack" has two different relevant meanings, and you are getting them mixed up, The real meaning is made quite clear from the parenthetical sentence at the end. To correctly understand it you must see that "attack" can mean either (1) a character's animated action of swinging with a weapon, or (2) the game server resolving a D&D attack roll with a weapon.
When a character makes an ATTACK(1) there is supposed to be a 100% chance of a mainhand ATTACK(2), an X% chance for another mainhand ATTACK(2) based on doublestrike, and a Y% chance for an offhand ATTACK(2) based on TWF feats.
Quote3:
A new mechanic has been introduced called "double strike". A character with a double strike chance has a chance to make an additional attack roll with their main hand weapon any time they make a main hand attack, on the target of the first attack.
This sentence uses "attack" for ATTACK(1) and "attack roll" for ATTACK(2). Even without knowing that, the fact that doublestrike is meant to only apply to mainhand is painfully clear.
Here's a highly related suggestion (but which applies only to gear, not buffs such as Inspire Courage):
http://forums.ddo.com/showthread.php?t=251537