Does Singapore still fall with Indomitable in Force Z?

Would Singapore still fall if Indomitable and Repulse survived with Force Z?

Probably not in this scenario, because carrier reconnaissance and repeated attacks on Japanese supply shipping could halt the Malayan advance while Allied naval and land forces reinforce Singapore.

Repeated attacks on Japanese supply shipping could stop the advance without requiring a dramatic improvement in British ground performance. Albacores, surface ships, and submarines would destroy supplies before unloading, forcing a pause while Allied reinforcements arrived. Singapore would provide British and Dutch submarines with a forward base close to the convoy routes. American submarines could also operate there, although this counterfactual would not cure their Mark 14 torpedo defects. Japanese troops could still advance far down the peninsula, but shortages of food and artillery ammunition would make the pace unsustainable. Force Z's survival and offensive action would also support morale ashore. The resulting judgment is that Singapore probably remains in Allied hands in this scenario.