The sequence was first employee probably said something like "make it slower if they aren't on AMP", and the second employee made some kind of suggestion to kill it altogether.
I think this gives us a timestamp on when Google got there.
Yeah it seems bizarre that they would try to hold on to that big of growth and not moderate it if this is the method to get it because there's no way it can be sustainably grown for long, but I guess if you're a VP only focused on this quarter's goals and the bonus you'll get out of it, it doesn't really much matter if growth craters a year or two out. You can cash out long before then.
They do often say "My bonuses are tied to growth, and my management is putting extreme pressure on me to deliver something that's impossible, and I don't see any way of delivering it in the expected time... so I'm going to do it the only way I see."
So from a probably naive view, getting rid of header bidding seems like it would be faster, not slower. Is the assertion being made that it isn't faster and it just so happens to also enrich the ad network?