Hmmm.. I think your first link is to the wrong hack. If everything were as you claim, the hack would need to precede the bank freeze in order for it to be in any way causal. I was originally writing this reply to refute your claim on that basis, but while investigating it I found that there was indeed another hack where bitcoin was stolen from bitfinex rather than Tether being stolen by Tether. Your article 2 cites the bitfinex hack as well. Furthermore, the IOU issued wasn't Tether, but rather some other token "worth" $1 called BFX. The rest of the story seems plausible, but it seems you have a mixup in your buildup and snag phases of the hypothesis (I'm not saying that it is outright wrong because of this though)