Hospice Eligible?

A hospice told mom that they can care for our dad now that he has Alzheimer’s.  He doesn’t seem that bad—he can still dress himself and work in the garden.  Do you think he is appropriate for hospice?
The average life expectancy for a person with Alzheimer’s is four and a half years but some live over 10 years.  To be eligible for hospice, the doctor must certify that he expects the patient to die within six months (if the disease runs its usual course), which usually occurs if both of the following criteria are present:
(1) Be at a FAST Stage ‘7c’.   Alzheimer’s progresses through seven stages:  “FAST” is short for Functional Assessment Stage with Stage 7 being the final one, indicating the patient is dependent on others for all their ADL’s (Activities of Daily Living – dressing, toileting, bathing, eating), can speak only a few words intelligibly and can no longer get from bed to the toilet without assistance.  And,
(2) They must have had at least one of the following conditions in the previous six months:   heart failure, emphysema [COPD], over 10% weight loss, a Stage 3 or 4 pressure sore (muscle or bone is exposed), a recurring kidney infection, fever despite antibiotics, a recurring aspiration pneumonia, be over age 70, or have a blood albumin (protein) less than 2.5.
It’s not easy to estimate when the last six months of life starts.  For example, just after a hospitalization for pneumonia or a fractured hip, the doctor may feel hospice is appropriate.  But then, after a few months of comfort-focused care in hospice, the patient may appear stable—so their care is now ‘custodial’ rather than ‘terminal’, meaning they won’t likely die in the next six months. 
If there’s no evidence of progressive decline (such as no weight loss, no change in ability to care for self), hospice must discharge them.  However, they can be readmitted when further decline occurs.