No. EN Publishing, as far as I have seen, does not state that you are buying a license to use the PDF.
For eBooks, Amazon clearly states that you are only buying a license to read the book. They can update or remove the book at any time. You used to be able to download an archived version of the book to manually add to your kindle in offline mode. They took that option away and have made further moves to restrict reading the licensed copy only on their kindle.
Many publishers and platforms have moved to this model of selling a revocable license to the content. In this manner, the buyer does not own the purchase and it can be removed or modified at any time.
This lessens the perceived value of a digital item. If someone does not own a copy, then they value it less.
Heck, it is illegal to pass my Steam, D&D Beyond, Fandango/Vudu, or Drivethrurpg accounts on the my kids when I die. It makes it so that none of that content is a transferable asset so property to lost value. It makes it difficult to see digital assets as equally valuable to physical ones.