The lambda's purpose here is only to turn it into a one-liner. It can be rewritten as

    def fizzbuzz(n):
        num_map = { 1: n, 6: "Fizz", 10: "Buzz", 0: "FizzBuzz" }
        return num_map[n**4%15]


    for i in range(100):
        print(fizzbuzz(i + 1))

The real skill would be to demonstrate that you know/remember/can apply Euler's totient theorem off-the-cuff in an interview!