The phenomenon of flies seemingly perceiving time in "slow motion" is often attributed to their faster visual processing capabilities rather than being direct evidence of time relativity. Flies have compound eyes, which allow them to process visual information at a much higher rate than humans with their single-lens eyes. This faster visual processing enables them to perceive motion and changes in their environment more rapidly.
While flies might react quickly to stimuli, it doesn't necessarily mean that time itself is passing more slowly for them. Instead, their ability to process visual information at a faster rate allows them to react swiftly to their surroundings.
The theory of relativity, on the other hand, deals with a different aspect of time called time dilation, which occurs when an object is moving at speeds close to the speed of light or experiencing strong gravitational fields. According to relativity, time can appear to pass differently for observers in different reference frames.
While the visual processing capabilities of flies are fascinating, they are not directly related to the concept of time relativity as described by Einstein's theory of relativity. Time dilation effects are typically observed at extreme speeds or in the presence of strong gravitational fields, and they have been experimentally verified in various contexts.