I only see one mention of a year towards the end -- 4 April 2009, the date of the first concert -- and the only other date I see is that construction began the

I only see one mention of a year towards the end -- 4 April 2009, the date of the first concert -- and the only other date I see is that construction began the 24th of October (with no year). Am I missing something or should I assume he built an amazing sounding piano, like no other piano in the world, with no prior experience, in <6 months?! Unbelievable.