Yeah. My eAOR is Aug 2nd. I passed medical test on Aug 23. The status changed to IP2 on the same day. I called IRCC on Sep 5, and they said my eligibility and criminality had both passed and they had just started my security. On sept 23, I called them again, the agent said 75% of my security had been done by that day (This is one of the reasons I doubt I am in CSS as it is unlikely that 75% of CSS can be done within 3 weeks).
There has been no update since then.
I'm a FSW-inland applicant and I am now in my final term at my university. I am the only one in my cohort who has applied under EE as all of my friends and classmates don't qualify for EE, so there is no any other's case to which I can compare mine and get some clues.
As to Immitracker, my understanding is that it contains roughly 5-7% of all applicants, which in terms of statistic studies is already an extremely huge sample, that's why I refer to it quite often, with a pinch of salt though. Among the 450 August eAOR applicants whose cases are monitored there, only two FSW applicants have already got PPR by today, and this is another reason I think I cannot confirm I'm under CSS without CBSA notes, as the vast majority haven't got their PPR either, so the timeline itself cannot be a reliable indicator for CSS.
If there is no delay, my CBSA and CSIS notes will come through in about 10 days' time, and then everything will become clear. As you said, if PPR is not issued 2-3 months after eligibility is passed, it is likely to be CSS, but I am now just straddling this 2-3 month mark. Maybe I will be convinced that I am under CSS if there is still no PPR in the next four weeks (by then the security check will have passed 3 month time, which is the upper limit of the "2--3 months theory". I am currently at the lower end of the 2-3 month timeframe, so I still have a little hope, though it is diminishing hahah..