You mean you received AIP SA on july 20 not september 20 !!! And yes this is the Landing interview . In the letter that they sent you will find what they request from you it is very clear for some they need specefic documents for others no like me my landing interview is on august 24 and they just asked me to bring my passeport 2 pictures the fees of PR . so just take a look at your landing interview letter.
Thanks so much for the reply! Yes, my AIP SA was 20 Jul 2018 - sorry for the mistake - in my case, it took exactly one month to get landing interview (as they called it in the email - Call In Notice) with interview scheduled in 2 weeks now. Good luck to everyone!