I guess you might already know, but there is a popular C++ reimplementation of the AlphaGo Zero bot concept, called Leela Zero:
I don’t know anything about the book that you mentioned, but if you are interested in studying C++ code rather than Python examples, I would recommend checking out Leela Zero.
Also, if you are interested in learning about general “deep learning” concepts, one of the most highly-regarded books on those topics is available for free online:
If you’re experienced with programming already, then switching to python shouldn’t be a problem, right? It’s not exactly a difficult language to learn. It’s very readable and there are no problems with anything you don’t want to spend time on while learning deep learning (e.g. memory allocation).
Especially when learning, it’s more useful to play around with the concepts than to build everything in a language of your choice.