Uses the acronym MDP several times before defining it. So perhaps not an introductory paper, but geared to those already immersed in the field.
The term is also used/linked in the fourth paragraph of the Wikipedia page for Reinforcement Learning.
It’s much more a table-stakes for talking about what problems the field tries to solve term than an exclusive preserve of the deeply immersed term.
It’s a bit like a primer on machine learning using the word “regression” casually a few times before actually defining it. Good editing practice? No. An actual road block to learning? Also no.