It serves as a starting point. It really depends on your frequency of operation.
A nice 'textbook' on the design of Doherty power amplifiers was published in 2018.
https://www.oreilly.com/library/view/doherty-power-amplifiers/9780128098752/
Several different implementations exist, some examples of which are:
1. Using transformers: Look at the work by Ercan et al (Here is one of their papers from their research group:
https://ieeexplore.ieee.org/document/7059254). This can also be done at lower frequencies and I think their first work was at 2.4GHz
2. Using transmission lines: Look at the paper by Hua Wang's group in ISSCC 2017. Personally, I found this approach to be much better at mmwave
3. Making Doherty combiners using a more mathematical approach: Look at the work done by Mustafa Ozen's group
https://ieeexplore.ieee.org/document/8103016
In ISSCC 2019, they even proposed a digital Doherty which was a very nice publication.