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.
There are people who claim to be pro-life, but they support abortion in the event of rape. That isn’t any different than saying a 2-year-old should be killed because his father was a rapist. The logic here is inconsistent.