This is from the medication guide from Amgen. Are you saying they are wrong about it being an injection?

How will I receive Prolia?
 Prolia is an injection that will be given to you by a healthcare professional. Prolia is injected under your skin (subcutaneous).
 You will receive Prolia 1 time every 6 months.
 You should take calcium and vitamin D as your doctor tells you to while you receive Prolia.
 If you miss a dose of Prolia, you should receive your injection as soon as you can.
 Take good care of your teeth and gums while you receive Prolia. Brush and floss your teeth regularly.
 Tell your dentist that you are receiving Prolia before you have dental work.