He’s overfeeding the snake, too.
That’s the ~trick~ part of the question.
They do not specify the size of the Boa.
If it’s 3000 grams or so, 3 small rats fed concurrently would be equivalent to one large rat and an appropriately sized meal.
[given the rule of thumb of prey body weight equals 15% of Boa body weight]
Nor do they specify the sex of the Boa or the time of year.
A female Boa 6000 grams+ could be bulking up for breeding season while a similarly sized male would *not* be eating because of breeding season.
If it’s not breeding season at all, then even at the rate of 3 small/1 large rat per week, they are feeding too often *unless* the snake is metabolizing the rats efficiently at that rate and eliminating weekly.
[and they don’t even mention which Boidae species...what if it’s one of the dwarf Boas?!?]
;D