i just noticed as well that you got discoloring on the aluminum as well. Its totally a chemical reaction , heat wouldn't cause the aluminum to do that.
you can take a torch to aluminum and it wouldn't go splotchy like that.
Not sure if i can change your mind. I think its safe imo
"I think the message means during the manufacturing process chemicals get on the board and mix with glue, the person who wrote the article believed they were blaming him for spraying chemicals which I think was wrong, they offered 20 back I think as part of admitting they made a mistake...