That only refers to the plant, which is toxic. I have that site on my favorites already I mean the fruit, it's really good for people but I'm not sure about tortoises.
I find in research that it has a lower level of toxicity than what is considered hazardous (now, keep in mind this is based on humans/mammals and not reptiles)....so, this will have to be something you are going to decide on and/or do further research....
My post here will bump your thread and hopefully others will be able to offer additional information.....