I'm not sure what they meant by siphon... There is no siphon in that picture. It's gravity fed. When the water in the fuge gets below the hole, it stops...
Leaks would be bad though...
You will need to get a hole cut in the fuge at the highest point of the water level in the tank. Probably 3 or so inches from the top would be good. Bulkhead connector and pipe or tubing, etc...
All in all, I think that would do it for you...