In special relativity, it is not accurate to say that light is "infinitely time dilated." Time dilation occurs when an object is moving relative to an observer at a significant fraction of the speed of light. As an object approaches the speed of light, time dilation becomes more pronounced, and the time experienced by the moving object appears to slow down from the perspective of a stationary observer.
However, the concept of time dilation does not apply to photons themselves. According to the theory of special relativity, massless particles such as photons always travel at the speed of light in a vacuum. From the perspective of a photon, no time elapses between its emission and absorption, as its journey is instantaneous.
When we observe light, we are typically observing it from a stationary frame of reference, and it is the relative motion between the light source, the observer, and any intervening objects that can affect the perceived speed or interval of light. For example, if the observer is moving relative to the source of light, they will perceive the light as Doppler shifted, either redshifted or blueshifted, depending on the direction of motion.
In summary, while light itself does not experience time dilation, the perception of light can be influenced by the relative motion between the light source and the observer, resulting in observable effects such as Doppler shifting.