That's like saying it's "a lie" to be in favor of abortion only in cases of ectopic pregnancies. No, many people are pro-life, but with the exception of ectopic/tubular pregnancies because it poses a great risk to the mother and the unborn child is not 100% viable (though there have been miracles of ectopic pregnancies coming to fruition).
You can support someone in choosing to die with dignity from a terminal and painful condition, but not be in favor of it when someone is simply "depressed". Depression isn't a terminal condition.
You can support someone in choosing to die with dignity from a terminal and painful condition, but not be in favor of it when someone is simply "depressed". Depression isn't a terminal condition.