[meowface]

What suggests this is a cover?

The NSA's biggest public facing role is to provide security to the government and private sectors. It's not at all unusual or suspicious that Alexander would meet with top CEOs to discuss security and mitigation strategies, without any of the CEOs knowing the extent of the wiretapping going on.

I highly doubt anyone at Google was aware of traffic being intercepted between their data centers during these meetings as well. I'm sure Alexander knew, but he only told Google what they needed to know.