Well, the article does say "buds", so maybe the full flower isn't such a problem, and you'd have to ingest quite a bit to be fatal. Animals are more susceptible too!
Also, those flowers on the cake in the book may be resting on some plastic wrap or waxed paper that we can't see in the pictures...or those may be dummy cakes that nobody is actually going to eat (I think that would be tacky if they are doing that and giving the impression it is safe to use them).
So, more than likely you could use them, carefully, and not have a problem...I'm just not sure I'd be willing to take a chance. If I were going to use them on a client's cake I'd definitely add a disclaimer to their contract so I wouldn't be held responsible! CYA (protect yourself) Janice
Right now I'm not really able to do as much actual decorating as I would like to do...I need knee replacement surgery, so I do lots of dreaming and planning and visiting here on CC.