Yep, I saw that one, too (twice actually; my daughter wanted to see it this morning.) I just don't understand why the concern that copper piping would not be safe to use with food. Copper piping has been used safely for a very long time in people's homes for water supply. I cod understand if the copper would leech out due to an acidic cake, but most cakes are not acidic.
I did have an issue with their tape though, because, like everyone else, I have never heard of cake-safe tape. Seemed strange to me.