Then it must include the baptized Prots who honor Sacred Scripture, taking it as a norm of belief and a pattern of life, and who show a sincere zeal, and are united with Christ within their own Churches or ecclesiastical [Protestant] communities.
And which contradicts your fellow RC. and his usual delusional nonsense.
Yep. Baptized Prots are baptized into the One True Church, the Catholic Church. They may not know it or agree with it or accept it, but if their baptism is valid (Triune with water) then they are members, not formal members, but members nonetheless of Christ's Church.
No one has figured out how they can be restored to a state of sanctifying grace once they've lost it status post sacramental baptism via mortal sin without the means of the forgiveness Christ established so they are in a deficient situation vis-à-vis their Catholic brethren, but its a start at least.