In regards to the latkes you were asking about, my guess is that the mix is loaded with matzah meal to bind it. Most probably they are not deep fried in a fryer but in a deep frying pan with lots of oil. Try it yourself. Add matzah meal to your latke mix, enough so that it's thick enough to work with and shape into that size you are looking for. Let me know how it works for you. Good Luck!!