I'm not going to jump to any conclusions about an overdue oil change or speculate on low oil, because...
First, I just don't have sufficient information on that.
Second, that technical service bulletin covers lots of Honda vehicles AND gives the part number of a replacement oil pressure switch.
However, I will speculate (based on many years of experience) that Honda had some sort of defect with the original switches and the part listed in the bulletin is a Revised oil pressure switch.
Most mechanics could use that DTC to determine that a faulty switch is likely the culprit and not need the help of a TSB, but not all/many mechanics would be aware that a revised part is available and is to be installed.
I've seen this happen many, many times. I'd bet that is the reason behind the TSB!
The originally installed oil pressure switch was a ticking time bomb!
Anybody wanna bet?