I read the article and did some additional research. The key takeaway is that the older you get, the more rest you need. Most of the example cases cited in the article where people who kept trying to train/race at the same level they did earlier in life. Rest and recovery are critical, as is knowing how far to push your body (or how far not to push it, as the case may be).

The article worried me at first, but I think I'm in a lower risk group than those mentioned who were affected. I ride around half the number of miles that I used to (and even at my max I was nowhere near those people), I don't have an unusually low RHR (most of the affected people did), I have more down time than them, and I have negligible caffeine intake (high intake is also an apparent risk factor).

But I'm still making changes. A few years ago I was on a long climb, and I hit 185bpm. For whatever reason, I felt like I could push that, so I made it to 197. These are the kinds of things I won't be doing anymore. It's unnecessary, especially being alone on the road and not in any sort of race. I started to wonder if Strava was going to kill me as I chased stupid KOMs I have no chance at, so I turned off segment warnings.

Overall it was a good article, and it's up to everyone how they use the information.