The person literally wrote “Read these threads on the DIS and understand the following terms:” before listing them.
It would have been really valuable to learn them by reading all about it, rather than by being given a vocabulary list. I know if I were the OP I would probably skip the reading if everything was spoonfed to me.
Giving someone a bunch of abbreviations and acronyms isn't helpful, nor is it welcoming. Additionally, those abbreviations aren't commonly used elsewhere. You can't go to google and type in "MF" and expect to get results, but you can type in "DVC Member fees" and get useful information. This board isn't the only source of information available, so I provided someone completely new to the process with information they can take elsewhere to learn.
Go use the DIS site search and search for MF. The first result isn't even relevant to DVC because some people are using it to ID the Millenium Falcon attraction ad DHS. So yeah, I think knowing for sure that MF means "member fees" and not something else is less confusing.