Google Compute Engine didn't even exist at the time that slide was made, or at least was not publicly available. That slide was about government intercepting Google's traffic, not cloud customer traffic.
It was certainly smaller, but GCE was first publicly available in April/May 2013, Snowden leaked things in June 2013. I'm not quite sure when this slide was released but sometime after that.
Google moved to fix the problem after the start of the leaks. Pretty quickly (good for them), but after.
The slide was created long before Snowden leaked it, which is before GCE was publicly available. I said, "before the slide was made," not "before the slide was leaked."
