I don't think I understand this since all my baking sheets all my life have been aluminum.
I think you could bake your pastries on the bottom of a roasting pan (aluminum or not) or on some foil.
I think the article you read must be mistaken. This is quoted several places. ;o)
Aluminum
Aluminum cookie sheets come in different styles such as rolled edges, edgeless and very high sides. Aluminum cookie sheets bake cookies uniformly since the aluminum metal properties conduct heat well. Highly acidic cookie doughs can have a negative reaction and produce a metallic flavor once the cookies are baked, so a silicone baking sheet is recommended as a barrier during baking.