Thank you for sharing the text-only link! Is there a "known" / easier / automated way to figure out such content urls? ... i.e., short of manually inspecting webpages by hand.
Unclear why the presumption that it isn't known or easy. Perhaps share examples of where it is unknown or difficult?
Also not sure what is meant by "manually inspecting webpages". This is not how it is done.
Reading the www as text is a choice. If use the "right" client then it's easy. If use the "wrong" client then it's difficult, if not impossible. For example, if one wants to read www as text, then using a graphical browser that auto-loads resources and auto-runs Javascript is not going to make it easy.
I use a text-only browser, 1.4 to 2.0 MiB, to read HTML. For the majority of websites no "content URL" is needed. If there is a "content URL", it usually returns XML or JSON. In that case no HTML browser is needed and I can use even smaller clients. Text-only www is easy... if using the right clients.
That is the experience I have had. I have been reading www as text-only for over twenty years.
Text-only:
https://assets.msn.com/content/view/v2/Detail/en-in/BB1n6aPX