If these systems don't allow lying in self defense, then they must not allow self defense at all, because lying in self defense is a trivial application of the general right to self defense.

'Rights' are most usefully thought of in political contexts; ethically, the question is not so much "Do I have a right to self-defense?" as "Should I defend myself?".

For Kant (the principal deontologist), lying is inherently self-defeating. The point of lying is to make someone believe what you say; but, if everyone would lie in that circumstance, then no one would believe what you say. And so lying cannot be universalized for any circumstance, and so is disallowed by the criterion of universalizability.