I postulate that robots need at least a single manipulator in the physical realm: Mechanical arm assembling car doors = robot. CNC machine that follows a path = robot. Mechs with chicken legs = robot. Brain in a vat = not a robot... but can be embedded in a robot.
Lexicography tends to be descriptive rather than prescriptive. If enough people use a word to mean a thing, that word means that thing. As least in some contexts. See also "gay", "hacker", etc...
Note that it is possible for a word's meaning to be "reclaimed", but it generally doesn't get that way by some small group of people just shouting "You're doing it wrong!"