It's one of those journals that pops up once in a while. It's like a sudden jump in WinRAR's profit graph : you don't expect it.
Jokes aside, the reason behind the updated "F-Zero MV Headcanons" is because the original texts were going to serve for a story I had in mind, but never got past the few Chapters. That, and motivation didn't come as naturally as I wanted it to be, so I abandoned that project.
Instead, I've remade those headcanons in a "canon-friendly" way : while keeping some elements from the original texts, I made sure they could still fit in in the franchise, or at least the SNES, X, GX and MV timeline. Revivedracer209 and Siontix of F-Zero Seppuku fame helped me proof-read the newer headcanons, so a big thanks to them.