The draw is random.Anybody whose confirmation number starting with 22 received invitation?if so, Is there still hope waiting for numbers beginning with 22 or no point in waiting ?
Also what is the current timeline of visitor visa or supervisa for parents from India?
There is this theory that IRCC draw according to first 2 digit of the confirmation number and province.
I don't see the revelant. It's a federal immigration program.
It's up to you to believe in that theory and give up hope before the date that IRCC posted for invitation email is done.
Good luck.