We're beating a dead horse on this topic. What you've read aligns with what other members have been saying.What does this mean
I read this on Canada in India (High commission of Canada) Facebook page
Family Reunification (Foreign national traveling to join a temporary resident in Canada)
Foreign nationals who have an immediate family member already residing in Canada as a worker, visitor, student or protected person are exempt from the travel restrictions. An adult child of a person residing in Canada may be eligible under this exemption. This is because, while the child is not an immediate family member of the parent under the definition above, the parent is an immediate family member of the child. The objective of this exemption is to facilitate reuniting immediate family members who have been separated as a result of these travel restrictions.
Please find more information in the following link to assist you regarding if you are exempt from the travel restrictions: Travel Restriction Measures
"An adult child of a person residing in Canada may be eligible under this exemption. This is because, while the child is not an immediate family member of the parent under the definition above, the parent is an immediate family member of the child."
The above clearly states what it means. Your brother obviously cannot qualify as your "child". Thus, his parents (your parents) have to immigrate to Canada first. Then, your brother can follow. Airlines will mostly NOT allow your brother to board the flight because of this rule. What others have been discussing is whether they can daisy chain the immigration interview at the airport in such a way that parents land first, so you brother can claim as indicated in quote. But, that is upon arrival in an official port of entry within Canada, and does not address whether airlines will deny boarding. The choice is yours to make, and don't let any of us come in the way of your decision making process.
Good luck!