The fact that it's a "PR disaster" for a researcher to have an ambitious project at one of the biggest tech companies on the planet, or to talk up their team on LinkedIn, is unbelievably ridiculous.
Talking about rewriting Windows at a rate of 1 million lines of code per engineer per month with LLMs is absolutely going to garner negative publicity, no matter how much you spin it with words like "ambitious" (do you work in PR? it sounds like it's your calling).
Why would you continue supposing such a thing when both the employee, and the employer, have said that your suppositions are wrong?
As @mrbungie says on this thread: "They took the stupidest metric ever and made a moronic target out of it"
The fact that there are distinguished engineers at MS who think that is a reasonable goal is frightening though.