Israel is already assassinating Iranian nuclear scientists with autonomous/remote-controlled gun platforms. The last one I’ve heard of apparently was able to use facial recognition and shoot the scientist in his car sparing the other passengers.
Next to that, putting the platform on a Spot seems almost trivial. Maybe one day they’ll be able to airdrop a bot, have it walk kilometers across a forest, and place itself in a position to snipe someone marked for death by one State or another.