Child-free from what I have read is the desire to not procreate, period. Passing along your dna inherently means you are going to procreate, thereby excluding it from the definition.
Unless the definition of child-free has changed, thats how I always understood it.
They don't have children. This means procreation in my world.
And the wiki page for shits and giggles
And for more shits and giggles, a little excerpt for clarity
The term "childfree" is distinct from the term "childless" in that the suffix '-free' indicates one's free choice to forgo procreation, while the suffix '-less' implies a lack.
Makes sense to me.