It's not "virtue signaling" when you're actually walking the walk. The person you're replying to didn't want to work for Kissinger et al, so they turned down what looked like a good job.

It absolutely is when (a) bragging on the internet about it, and (b) accepting another job which is equally evil. Probably even moreso when still living in the US, which has taken advantage of Kissinger's aggressive geopolitical strategies (and part of the reason why the US is such a wealthy and dominant superpower). But no one wants to have serious conversations, they just want the upvote for the moral points of not joining Theranos while joining Apple (yawn).

One can virtue signal while being virtuous. It is not synonymous with hypocrisy. Virtue signalling refers to the act of expressing opinions or actions with the primary intent of demonstrating that you are a moral and righteous individual.