Or, maybe, your analysis is entirely too superficial. One thing that occurred to me right away was to look and see if you were conflating pre-existing conditions and multiple causes. This appears to be the case. For example, it looks like many covid patients also get pneumonia.
In such cases, they're going to report the patient as having multiple health problems, even though covid was the cause of the pneumonia.

I didn't spend much time on this issue, because I actually do tend to trust health professionals to be better informed on the subject than the average person who decides to write a blog post from a likely biased point of view. But even so, just using the link from your post to identify the most common secondary health issue and a quick search of the web, I was able to figure out where your math went badly wrong: https://www.webmd.com/lung/covid-and-pneumonia#1