For the question Should I report a PhD student’s incompetence to their supervisor? I gave an answer based on an assumption that the OP and a supervisor were based at the same institution - information which was not originally apparent. Since then, OP has clarified that my assumption was incorrect, and this invalidates my answer.
Should I now remove my (substantially upvoted) answer which does not address OP's exact situation? Or should I leave it to stand on the basis that it may be helpful to others in similar but not identical situations? In any case I will add a note to indicate my incorrect assumption.