Yes, it was the position of the ailerons that prompted the question, but I can see now that I was wrong, as the elevator looks to be roughly neutral rather than the up position I'd expect if you'd used the harness. Serves me right for being smart
On the 2160 I fly, the harness is used to lock the controls too. Always wondered what the 'proper' way was, but when I saw your picture it made me realise, maybe using the harness is the standard way on the robin!
Regards,
MQ.