Does this only play on macs?
No, Audible plays on almost all platforms. Just because it is a book about a guy who is known for Apple computers doesnt mean that it only plays on an apple computer. After all Audible is owned by Amazon.
This is not a slickdeal. This is an every day promotion that the OP just happens to be promoting with a hot new book. With this promotion you can get just about anybook in their catalog.
Vague questions receive vague answers . . . . . .