I think they look like a good breeder!
And, YES, I feel that generally it's a good idea for a breeder to require that their puppies are altered. The average person not only doesn't want to deal with an intact dog (messy heats, hormones, frustration, the desire to breed, roaming, etc) but also does not need to breeding their dog intentionally or accidentally. I have soooo much respect for them because they don't require pups to be altered by 6 months. At least they want people to wait until the dog is fully grown! Props for that.
The breeder that I plan on buying a puppy from also requires puppies to be altered (before 2 years of age). However, they obviously make an exception for me, some one they KNOW is going to show/work the puppy, keep them from ever having an accidental litter, train them properly regardless of their hormones, and never breed them unless they are the absolute best example of their breed. General rules like that for average dog owners are usually not black and white. When you build a relationship with your breeder, and let them know how much of a wonderful, loving, caring, educated dog owner you are... they aren't going to force you to alter a dog, or seize them from you for putting them on a tie-out while camping, or whatever.
And as far as the vitamins. Oh well? They do not say "YOU MUST GIVE YOUR PUPPY THESE VITAMINS!" they say it's a good idea. My breeder says it's a good idea to feed your puppy raw, but they don't force buyers to do so.
I think it's difficult to completely judge a breeder by their website. Of course, preciousteacupmaltipoos.com is not a good breeder and it's obvious
but I would meet the breeder and the dogs, meet the puppies they have produced and their owners, and talk to the breeder and get to know them and let them know who you are.