Some reviews that try to make a book look bad are so ill-informed and malicious that they actually make a good book look better.
Unfortunately, religion has infected science and the result is bad religion and bad science.
A bottleneck of two, or a first pair at our origin older than 500,000 years, is possible.
Obviously, evolutionary “laws” are quite malleable and have to give way when they become too cumbersome.
The changes involved in adapting a generic mammalian template into a whale are certainly not all simple, independent, single-letter changes.