I once had a recruiter tell me: “Elon Musk is one of the easiest people on earth to poach senior leadership out from under.” After eighteen months in the gulag

I once had a recruiter tell me: “Elon Musk is one of the easiest people on earth to poach senior leadership out from under.” After eighteen months in the gulag of rocketry/EVs, many managers are ready to cry “Uncle”. As a non-native speaker, I have the hardest time parsing this sentence, could anyone help me out? What does it mean when someone poaches “leadership out from under” — does it mean that leadership grows internally, rather than sourced externally? Or that they’re fleeing away (assuming “poaching out” mean the reverse of “poaching”) And I assume that the “uncle” in this case is Elon?