No, the existence of antimatter does not imply that light cannot travel through a vacuum. Light can indeed propagate through a vacuum regardless of the presence of antimatter.
In physics, a vacuum refers to a region devoid of matter and, in particular, free from particles and gases. A vacuum can still contain fields and radiation, such as electromagnetic fields and photons, which are the particles of light. These fields can exist and propagate through empty space without the need for any matter to be present.
Antimatter, on the other hand, consists of particles that have the same mass as their corresponding matter counterparts but possess opposite charges. When matter and antimatter particles come into contact, they can annihilate each other, releasing energy. However, this annihilation process does not prevent light from traveling through a vacuum.
Light, being an electromagnetic wave, consists of oscillating electric and magnetic fields. These fields can propagate through empty space, including a vacuum, without requiring any matter or antimatter particles. Therefore, the existence of antimatter does not affect the ability of light to travel through a vacuum.