I have not incorrectly assumed, i merely guessed what could have been the problem,  a faulty fan / bad fan wiring  do not cause the miner to not show on your router, i thought he might have altered the network cable  ( which is the first reason why a miner wouldn't show up on the network) unless the control board is toasted which again can't happen simply for using a bad fan.

Back to my analogy, if someone says they cut the radio wire and engine won't start, common sense suggests he likely has tempered with another wire as there is no way a radio wire will stop an engine from kicking in.

But you are right actually, i might have gone way too far with my speculation , but that has nothing to do with reading slow or fast. Sorry for being mean tho.