Yep. They get credit for your donation & they get a tax write-off for the coupons, and they get to sell more stuff so you’ll get the “value” out of the coupons. It’s a win win win for them and only a win for you if you were going to otherwise buy the exact same things the coupons covered.
Apparently it’s hydrogen peroxide and not baking soda but I am not aware of hydrogen peroxide being especially toxic.