Is that true?
Essentially you can use deadly force to defend yourself, your home or your family if you feel life or limb are threatened. If a person uses force or stealth to enter your home they are automatically considered to be threatening life and limb and you can use deadly force to stop them.
Don't ever think of it as you being allowed to kill someone if they step foot on your property. That's never really the case. You should always consider it as what you are allowed to do to stop someone from threatening the life of you or your family. Once the threat has been neutralized you are no longer allowed to use deadly force.