Why it is not ready to be exported on android? you just have to install all the appropriate files for android export(see the manual) cook it and run the bat. File from your cooked android project while your phone is plugged in and in developer mode. The demo will run fine as long as your hardware can handle it.Ido not remember if this demo is AutoPlay or not.if it is you have to do nothing.If it needs mouse input just go in the gamemode settings, enable touch and mouse input and create a blueprint that has a custom movement with a touch or a swipe.It should take you 5 minutes if you know what you are doing.
I have ran the Simple temple demo on my Galaxy S5 with very decent frame rates, so it is in fact ready to be exported. Not sure why your getting an issue. Can you outline the steps you took to get the above error.