You are right. I have written on this several times since the late 90s in this forum in response to dummies beating their hairless and scrawny chest thinking that the SAF is some sort of invincible powerful killing machine.
There is zero chance that Singapore can survive within the few hours of battle after Malaysia neutralises Singapore's "powerful" airforce by cratering the runways and roads meant as alternative runways, as well as destroying the pathetic 20-30km supply lines, military bases and other civilian and military targets that the MAF has already identified for destruction with their artillery and MLRS. The newer AR3s have a range of 280km. This means the Malaysians do not even have to base their MLRs in the hills of Johore. They can base them further up North in the states of Malaccca, Negri Sembilan, Selangor and Pahang.
In the years of dealing with Sinkies, I find that they are only exam smart. They are pathetically stupid in the area of common sense and simple analysis. You see these dumbfucks talking about "war", "invasion", etc as though it's a walk in the park. Or that the Malaysians are too dumb and powerless to respond or do anything. Or that the MAF are armed only with their kris, kampung-made catapaults, bows and arrows. Those in the know, the paper generals and officer corp, as well as those in the civil service including those in government and those with at least half a brain, know fully well that Singapore cannot survive a military conflict. Like me, they have their exit plans for themselves and their families fully in place. This includes the government fleeing, ostensibly to set a up a "government-in-exile" to oversee any military conflicts in the safety and comfort of Australia
Sinkies are really, really stupid fucks. They need to take a good hard look in the mirror and ask themselves whether they can even fight a simple Ah Beng fight in a coffeeshop before they spout rubbish and nonsensical shit about "war" and "invasion".