I would agree except it actually says "if you have a spell prepared"...why would you assume the feat doesn't let you prepare ritual spells? Like...seriously. Why would it not do that? Isn't that literally the point of it, to let people use ritual spells despite not being a "proper" spellcaster
If there was another ability that said "when you prepare spells" we wouldn't assume the fighter could do it?
I agree with you its probably RAI though.