No, Albert Einstein did not say that the speed of light is variable. In fact, Einstein's theory of special relativity, which he developed in 1905, established that the speed of light in a vacuum is constant and is the same for all observers, regardless of their relative motion. This constancy of the speed of light is a fundamental principle of special relativity.
Einstein's theory of special relativity introduced the concept that the laws of physics, including the constancy of the speed of light, remain the same for all observers in uniform motion relative to each other. This theory led to profound insights into space, time, and the interplay between them.
It's important to note that special relativity does not address the speed of light in different mediums, such as air or water, where it can vary. However, in a vacuum, which was the focus of Einstein's theory, the speed of light is indeed constant and does not change.