I know people are reacting like its expected anyway because of the amount of espionage that goes on, but this is honestly more of a cold war era tactic.

Why would China risk souring relations right after a major diplomatic trip with some throw away gadgets that any competent military security would find immediately and proceed to document it?

China can just get that high level information via a million other ways including Trump himself. They probably have a truthsocial scrapper that automatically tells them exactly what Trump is gonna do next by deciphering his insane posts lol.