Which could also mean an intelligence officer('s personal machine, who is known to be) working out of the agency's hq... It implies that the IP was from GRU HQ,

Which could also mean an intelligence officer('s personal machine, who is known to be) working out of the agency's hq... It implies that the IP was from GRU HQ, but the only definite statement is that it is this specific officer, who works at this specific location.