Now lets go back into the 1800s when record keeping by your own admission was even worse and it is very possible the date could be wrong. Throw in the whole lunar calander thing and who knows.
Maybe Fut San had it wrong, nobody knows for sure.
Maybe King Mui got it wrong.
That is true. the record keeping was horrible, especially if you were members of the Hung Mun. The more you speak to the elders in your lineage they might tell you how Secrecy was paramount back then. A mere suspicion could get you killed instantly.
Hung Sing Boyz, we gottit on lock down
when he's around quick to ground and pound a clown
Bruh we thought you knew better
when it comes to head huntin, ain't no one can do it better