Yes, take a look at the hyperlinks that appear below the diagrams. I think these are the types of links that you are asking about. The links do generate a diagram dynamically using a URL request with the encoded diagram text in the path / query string of the URL.
https://www.planttext.com/plantuml/TYPE/ENCODED_DIAGRAM
For example…
https://www.planttext.com/plantuml/img/SoWkIImgAStDuSfDLT3LjLFGA2hDq-HoICrB0Ge20000
https://www.planttext.com/plantuml/svg/SoWkIImgAStDuSfDLT3LjLFGA2hDq-HoICrB0Ge20000
https://www.planttext.com/plantuml/txt/SoWkIImgAStDuSfDLT3LjLFGA2hDq-HoICrB0Ge20000
You can also use this URL to send someone to this application and have the diagram decoded straight into the editor…
https://www.planttext.com/?text=ENCODED_DIAGRAM
For example…
https://www.planttext.com/?text=SoWkIImgAStDuSfDLT3LjLFGA2hDq-HoICrB0Ge20000
Let me know if this doesn’t answer your question.