Golijov Deadline Controversy

Here from Wikipedia is the explanation for the Dawn Upshaw concert:

Golijov came under scrutiny in 2011 for a series of high-profile commissions that were either delayed or cancelled. A violin concerto written for the LA Phil was not completed in time, and had to be replaced on the program. This followed a similar cancellation in 2010, when a song cycle that was scheduled had to be removed from the program when it was not complete in time.  The March, 2011 premiere of a new string quartet for the St. Lawrence Quartet was also delayed due to a missed deadline.