That is the most inane attempt to corrupt Church teaching I have seen in weeks. The Catechism is not a physics text, it is a theological and philosoplical work. In this context the term "Substance" must be used in a theological and philosophical context.
Substance, when used in a philosophical context is a term used to denote the changeless substratum presumed in some philosophies to be present in all things. The Greek antecedents to the New Testament defined substance as that which possesses attributes but is itself the attribute of nothing. Less precise usage identifies substance with being and essence.
If you still want to claim the Church teaches something else you have to deal with article 252 of the Catechism.
Peace with you.
ROFL Id say the substance of what the RCC teaches is mystical paganism.
Mixing theology with philosophy is like mixing water and oil...They don't mix...
Philosophy is man's faulty wisdom...Bible is God's wisdom...And never the twain shall meet...
You can not expound on scripture with philosophy...