Is composite metal foil a metal?

Yes
‌Composite metal foil is a metal‌. Composite metal foil is formed by stacking multiple layers of metal foil in parallel. Although it contains multiple layers of metal foil, each layer is still a metal material. Composite metal foil can be formed by stacking multiple layers of metal foil in parallel, with a high degree of freedom in the stacking method, and the conductor size of the composite metal foil is small, and the coil filling rate of the magnetic component is high‌.