Is this the letter that you are saying is your AIP:
Dear xxxx:
This refers to the Application for Permanent Residence you made under the Spouse or
Common-Law Partner in Canada Class.
It has been determined that you meet the eligibility requirements to apply for permanent
residence as a member of the spouse or common-law partner in Canada class. Please note that
a final decision will not be made until all remaining requirements for becoming a permanent
resident have been met. These requirements include medical, security and background checks
for you and, if applicable, all of your family members, both in Canada and abroad, even if they
are not applying to join you in Canada at this time. You cannot become a permanent resident
until you and all your family members have met these requirements.
If so, then it is in fact AIP. Some people have received other letters that turned out NOT to actually be AIP.
If the letter that you (the sponsored person) received is anything other than what is posted above, you may NOT have received AIP, in which case the Etobicoke letter is likely an interview notification.