Amazon is odd that way. Everyone has a base that low, even VPs. All of the comp is in RSUs and hiring bonus for the first two years. Even someone with a total comp of $1M a year will have a base salary of $250K, and a hiring bonus of $700K a year, and then RSUs that in theory make up the rest, as long as AMZN goes up at least 15% per year.
When the stock was on a tear, some people would make 2x or 3x their expected total comp. But on down stock years, you could end up at 80% of the promised comp.