Free your article reminds me of a movie I watched in a high school class called The Lion in Winter. The movie really made an impression on me for a couple of reasons; firstly, it was the first time I was genuinely entertained by an OLD movie (like VERY old, to me, the movie was made in the 60's), especially just a plain drama. Like most kids older movies were just boring and unexciting to me, and while I never complained about getting to watch a movie in school it was very "meh, whatever" most of the time if it was an older movie like this. But this one was different. The movie stars Katherine Hepburn and Peter O'Toole as Eleanor and Henry II and is about this whole extreme love-hate thing they had going on; there was much scheming and backbiting and insulting going on but they were both so happy to be with each other while doing it, and it was honestly hilarious at times. It was the first time I'd seen that kind of character dynamic and I loved it.
Anyway the plot and all their scheming involve their three sons, Richard, Geoffrey (neglected middle child, lol) and John. The second reason the movie made an impression on me was because I was like, "Wait - is that the eventual Richard and John from the Robin Hood stories?" and the answer is yes!, although that has nothing to do with this movie. And another supporting character in the movie as Phillip II, and this brings up the third reason the movie made an impression - I only vaguely recognized Katherine Hepburn but not really any of the other actors in the movie EXCEPT for Richard and Phillip II, who were played by a very young Anthony Hopkins and Richard Dalton - yes THAT Anthony Hopkins and THAT Richard Dalton, and I definitely recognized them. And I found out that this movie was the first major movie role for both of them!
But yeah anyway, at one point in the movie it's not-merely-suggested that Richard and Phillip II had had a gay moment, at least once. And it isn't just mentioned in passing, like it's a focus of conflict and tension in a couple of scenes. Meh whatever, I don't know enough about the historical basis of any of it; but if your article is right about the incident that it mentions, it kind of makes sense to me that incident was where this whole minor plot point must have come from. The movie was based on a play that was also written in the 1960's, so at least by that point whatever had happened between Richard and Phillip was being perceived as romantic, not platonic. It makes me wonder if this was a debated thing and for how long, or whether it was just the author of that play who thought of the incident that way.