I'm also baffled as to why the guide would recommend an HHI purchase for someone who wants to stay at VGC. It makes no sense.
The HHI dues are among the highest for all
DVC properties, and at risk to go higher, since the property is in a hurricane-prone area. Your guide may have been correct in saying that you'd save a few thousand upfront by buying HHI, but they left out the part where you'd be spending many thousands more over the life of the contract than you would at VGC.
I would also think the very small number of VGC villas would put you at real risk of not being able to reserve at 7 months.
So, to recap, your guide sold you a resort that is 3000 miles from the place you want to vacation, will make it tough for you to book the resort you do want, will cost you far more in maintenance fees, and has a contract that's about 20 years shorter. I really hate to say this, but it sounds to me like the guide had some HHI points they needed to dump. Run, don't walk, away from this contract.
Look for a VGC resale contract. Cheaper maintenance fees, 11-month booking window, and 18 extra years of vacations.