Does it mean we are banning the taxation of old or disabled people to pay for elementary and secondary school? Seems a bit weird, why not just not do said thin

Does it mean we are banning the taxation of old or disabled people to pay for elementary and secondary school? Seems a bit weird, why not just not do said thing, why is there a need for a law banning it? Is it just to make things difficult for the other side (presumably democrats)?