Self mutilation, temporary or permanent, through contraception is not a solution of any problem.
Yes, the demographic crisis can be reversed, chiefly by eschewing the contraceptive mentality and return to traditional sexual morals. Now that would be a solution to an real problem, which for motst peopel does not require any technology.
Recognizing a constraint is not moral relativism.
A line of argument that leads to the conclusion that aspirin and decongestant are instruments of “self-mutilation” is not going to convince sane people.