No. There were three matches played by Trinidad Colleges vs Brazil U-20, one at the Oval, one at Skinner Park and the third I don't have a record of (so you could be right if Gellineau scored in that one)
Edit: after checking again, only the first match was an All College team. The others were in fact the national team. Changes noted below:
1966-01-19, QP Oval, Brazil U-20 5:1 All Colleges
Goalscorers for Brazil were: Airton Guilherme (fourth and 57th minutes), Nelson de Oliveria (sixth and 32nd minutes), and Luis Carlos Freitas (75th). Trinidad's goal was scored by ....
1966-01-22, Skinner Park, Brazil U-20 5:0 Trinidad
Brazil led 3-0 at half time through goals by Airton (15 minutes, 17), and Nelson (28), and added further goals in the second half through Amaral (67, penalty) and Edu (77).
1966-01-26, QP Oval, Brazil U-20 2:3 Trinidad
Archibald (45th) Corneal (56th penalty and 59th) scored for Trinidad and Freitas (15th) and Edu (23rd) scored for the Brazillians.
1966-01-28, Skinner Park, Brazil U-20 ?:? Trinidad