All copper pans including red copper pans are not toxic.
The red copper pans and all copper pans are free of any toxic chemicals or coatings and contain no PFOA and PTFE.
So that makes red copper pans and any copper pans or other copper cookware safe to cook food on and eat the food off the copper pans and red copper pans is safe and not harmful to your health.
I've cooked many foods in red copper pans and never have had any health issues from them and I love my red copper pans and even my regular copper pans.
Copper is okay and actually our bodies have trace amounts of copper in our blood which keeps us healthy.
If the red copper pans were toxic enough to cause health issues they would stop being sold but they are perfectly safe to use and cook with.