Well I don't know the source of this info (I mean outside of that article), but I would argue that a lot of these underlying issues are not serious, and not something that you can simplify in the manner you do. People can live with many of these without big problems. Heck I think that the number of people with commodities in the US alone is like 60%, with 40% with two or more.
There is also another factor that come into play here, which is (at least on most of the charts I have seen) a lot of the underlying issues that patients have died from were actually caused by covid19. This is the gun shot comparison, there was a medic showing death certificates from people dying from a gun shot wound. On each one there were several "underlying" causes, like internal bleeding, liver laceration, etc. The problem with our layman's interpretations of this is that we don't realise that many of the causes are/were actually related to what the bullet did to the body.
I mean looking at CDC's website, the most common comorbidity is pneumonia (40+%), second most common is respiratory failure (30+%), those two are comorbidities at the time of death, but they were caused by covid19.
Then we have high blood pressure, comorbidity in 25% of deaths, which would not fall under the category caused by covid19. But then again about 25% of the population actually suffers from it.
edit: relevant to what
@DecadeofDarkness posted as well
edit: this is what I mean by playing the numbers game, find a stat you (not literally you) like and show something which will WOW the reader and go with it. The context is left out though, and it is very important.