Looking at the link it appears that the freewheel has been threaded on the fixed side, not the freewheel side.
No?
I'm not so sure. Even if it had been, the thread for the lockring should poke out further through the middle of the freewheel. The fact that the freewheel seems to be hardly on the threads and yet "the chain is very close to the spokes", along with the absence of notches to fit a remover tool, and the fact that the thread on the freewheel comes all the way to the visible side makes me think it's been put on backwards. Hence my question about whether he's tried riding it.
I'm not so sure. Even if it had been, the thread for the lockring should poke out further through the middle of the freewheel. The fact that the freewheel seems to be hardly on the threads and yet "the chain is very close to the spokes", along with the absence of notches to fit a remover tool, and the fact that the thread on the freewheel comes all the way to the visible side makes me think it's been put on backwards. Hence my question about whether he's tried riding it.