Look, the problem with the hole thread is that there is no clear cut off line. On one point Nintendo shipped patched motherboard to the factory and the result is that
patched and unpatched exist within the same serial space. Someone get a patched Switch while others get an unpatched while the serials are very close together. The only somewhat reliable
way to get an unpatched Switch to buy a Swtich with a serial number below the one marked on green in the TL;DR section.
The purpose of the thread was to get a Switch with a certain firmware in the beginning. That's because all the Firmwares are listed. Some people thought they would get an unpatched one if they compare the serials in the firmware range section with the serial section in the patched range section (the one in red) and were upset because that doesn't work. I know that the thread has 123 pages, but this is at least the 10th time I wrote this, and honestly all the "iS the serial ahck pls reply k thx" is very tiresome, while on the other side, no one is reporting there newly bought Switched anymore. Without the data, we will never get a clear picture.
The error you said is valid, I will correct it. It just drowned in all the people who can't compare tow numbers.