I didn’t say poly grad lose to JC grad.

You did. Here's what you said:

"Not only delay 3 years BUT delay 3 years to enter a route that pay less and has less future potential."

He could have studied computing in A levels too.

Do you seriously think computing in A levels (assuming that schools in Singapore offer it, which they don't) is comparable to a diploma in Infocomm Sec?

Basic facts are there, Uni grads earn more than poly grads except for some rare cases. He choose not to go uni when he could as he was the top grad from his poly cohort due to whatever reasons only known to himself

Why do you assume that he won't go to uni after poly?