I hope this info will help.
I raised a web form on 28th August, asking them to give me aip quickly as my semester is going to start and it can't be deferred. On 3rd September I received my aip via email., but it looks like they saw my webform after that and this was there reply.
Thank you for contacting Immigration, Refugees and Citizenship Canada (IRCC).
While examining your file, we were pleased to notice that the situation reported in your Web form request is now resolved.
Do not hesitate to contact us via the
IRCC Web form for any other enquiry.
For further information regarding your enquiry, please refer to the email that was sent to you on September 3, 2020, to the following address: (my email was mentioned here)
We recommend that you also verify your junk mail folder, since emails may be rerouted there if your email program is set to filter or block emails coming from outside of your contact list.
Furthermore, since this letter was sent by email, it will not be available in the messages section of your online account.
If you have not received our email, you may advise us by using the
IRCC Web form and it will be our pleasure to send it back to you.
We hope the information provided is helpful in assisting you with your enquiry.
Conclusions:
The Pdfs of the application moving to next stage is indeed Aip( not just a pre-eligibiltiy check), as that's what my enquiry was and they said it was resolved.
Also, don't expect it to be reflected on your account as they mentioned above, it will ne only sent via email.