All told, yikes. That’s a pretty damning — and funny — insight into how much Google's own employees believed in the browsing mode's privacy, which is to say not a lot.
As a former Googler, I'll say this: You will have a hard time finding people more critical of many of the actions of Google (the company) than Googlers (the employees of said company.) Even after all these years, and into the Sundar times, there's a rather healthy internal culture of critique there. Usually with the best interests of the broader mission statement of the company at heart.
Naturally much of this is necessarily muted in external communications, and in some forms of writing... for legal reasons. Sounds like some people slipped up here and didn't pay attention in their mandatory communications training.
TLDR it's not "damning" -- geeks inside Google are much the same as geeks outside. They're just taking a paycheck.