It's subtle.
The editor is exactly the same in the Stories system as here. The editor takes what you put into it. When you are not remotely technically savvy, such as your example of a link to an 82 yo author, you get what you get.
The display portion of stories actively strips out excessive double spacing and a number of other common issues to try to correct for bad inputs from the members. In an ideal situation, an author can copy their text from their word processor, paste into the editor, and then click the button that clears formatting. This would give the cleanest input. Unfortunately, a lot of people overuse italics and bold and would then have to manually put it back in. This is why we don't automatically strip formatting on paste.
Some authors (not the one linked, to be clear) also ignore us when we tell them to use plain text with minimal formatting so that it shows up correctly in most browsers. When we remind them, they yell at us like we are somehow destroying their art. 10 years of that with self posting... and well... no... you want an author to fix something, reach out and help them fix it. We can't fix that problem from the system end. We've done as much as we can.