Thing is, if you did know there was session spoofing or people with an authenticator was hacked, you would be forced to lie anyways and would deflect the truth.
So while what you said may be true, it really holds no water considering your primary goal is to protect the interests of Blizzard and their primary interest with Diablo 3 is the RMAH.
If it has been found that session spoofing was happening, or people hacked with an authenticator it would put a serious damper on the RMAH, possibly destroy it if people cannot trust that their hard earn money used to buy content would not be hacked away even with every precaution.
The RMAH is set to make Blizzard a lot of money, so again, what you say may very well be true, it cannot be taken as fact considering the truth could cost Blizzard lots of money.
It has become standard for Corporations to protect their revenue streams by deflecting the truth, redirecting blame or straight up misrepresenting the truth.
To sum, up, probably not worth spending too much time defending your position. It would be like McDonalds trying to initiate a get healthy program.
All words from someone who does not understand the legal repercussions if Blizzard were found to be lying or hiding the truth.
Forget the legal repercussions. Can you imagine the PR nightmare that would ensue if it discovered that Blizzard covered up compromises to their servers?