Correct, they don't actually mention "CSQ" in their letter, but yes, this is your letter to apply for the CSQ, I have the same. You must print it and submit it with the rest of your CSQ application.
No, the portals are different.
1 - GCKEY Portal:
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/account.html
2 - NEW PR family sponsorship application tracker: https://prt-srp.apps.cic.gc.ca/en/
3 - The portal that you applied for the PR: https://prson-srpel.apps.cic.gc.ca/en/login
1 - I can't link my PR Application still.
2 - Works flawlessly for, and created both accounts for me and my wife.
3 - Status: Submitted | Action: View.
@
mili_0923 try creating an account with 2.
Check my CSQ Letter and see if it looks like yours.
LMK if you have more questions! also, hope we get our CSQ soon...