Gavra,
Please look carefully in YD; it seems you skipped the word “lene’arim”. It’s tzedaka to support the Torah learning of children, which is incumbent upon their parents/community to provide. It’s not incumbent upon a community to support the Torah learning of able-bodied adults who choose to learn in kollel.
“Are you Chozer regarding Rav Heinemann’s Psak on ovens no longer being valid?”
Am I chozer on his psak no longer being valid? It’s for me to say his psak isn’t valid? Huh?