Radar resources redirected from North Africa to Singapore

Would Singapore still need better radar for this counterfactual to work?

Yes, but an earlier North African success could redirect radar sets and ships to Singapore in 1941.

Different theatre outcomes could release scarce technical equipment for use elsewhere. If North Africa requires fewer ships and radar sets, those resources become available before Japan attacks. Sending them east in 1941 improves warning, fighter direction, and the defensive network supporting Singapore. The counterfactual therefore depends on logistics and allocation as much as on the two surviving carrier hulls.