Unfortunately the tweet is contrary to what several forum participants have reported. The problem reported has been that applications were returned because they were not complete when "yes" was checked in response to 9.c. and no CIT 0177 was submitted. This has been reported EVEN when an explanation was also included.
It is entirely possible, actually quite feasible, that IRCC has recognized the difficulty with 9.c. and has modified the completeness screening so that those who check "yes," but do not include CIT 0177, they are no longer having their applications returned as incomplete. This would make sense.
BUT absent some credible reports from applicants who take this approach and have gotten AOR (acknowledgement of receipt means the application has passed the completeness screening), it is difficult to trust this will ALWAYS work. (And therein is the rub so common to many questions: what works sometimes, or even most of the time, might not always work, and we generally do not want to take the chance we are among those for whom it does not work. We like to know what will for sure work.)
Hopefully some among those who follow the tweet answer (and thus check "yes" to 9.c. and simply not include a CIT 0177) will report back here if they get AOR . . . or, report their application has been returned as incomplete if that happens.
In any event, until there is more extensive confirmation, some may prefer to play it safe and nonetheless submit a CIT 0177 populated with "Not Applicable" in its fields, thereby following the instructions albeit submitting a worthless, irrelevant form (the NA CIT 0177) with the application. (Noting, after all, the tweet essentially says to NOT follow the instructions in the application form, whereas generally it is best to simply and directly follow the instructions.)