definitely the latter, it is even referenced in the foreword:
> Its goal is not to be exhaustive, but rather minimalist
and easy to read. For this reason, it follows the format
of The Little Book of Deep Learning [Fleuret 2023]. Its
tone, however, is closer to that of a blog post, as the
book is built around a single narrative thread. Its
structure broadly follows that of Sutton and Barto’s
Reinforcement Learning: An Introduction [Sutton et al.
2018], which remains the canonical reference on the
subject.