Most likely you have no idea what you are talking about.
It's normal under 2-stage processing, it's something that follows a pattern with thousands of SDS files and not something that is only happening with your file. In the recent IRCC webinar, they have answered this question and replied so as to not to ponder over it.
I applied in July with upfront medicals. My medical is not updated in GC Key and in the review of eligibility it shows we are reviewing whether you meet the eligibility requirements. Does that mean my eligibility review has started?