The agency where I worked (social media marketing) would make outrageous claims and give a lot of "smoke and mirror" presentations to both land clients and give them the impression they were getting more for their money than they were. They'd engage in astroturf, fake views, and generally do whatever it took to deliver on the number they promised. It made me uncomfortable, but I was young in my career and thought that's just how the world worked. Thankfully I didn't have to stay there long enough for it to really rub off on me. I've heard enough stories from others over the years to know this wasn't an isolated experience.
Most agencies only have a few big customers paying everyone's paychecks, and it's far easier to retain a client than land a new one. As a result, they're highly incentivized to do whatever it takes to keep them. It's probably the biggest dark side of a directly incentivized culture.
Hearing that an agency for Boeing did this doesn't surprise me. What might be worse is it's quite possible Boeing is finding out through this reporting.