The timing chain on my 2012 was replaced under warranty at around 25k miles. The dealer tech noticed that it sounded like a cement mixer once warmed up. This is a separate defect from the oil consumption/pistons and rings issue (which mine exhibited starting around 50k miles).
Since you brought it in under the warranty period you should try to establish the manufacturing date and argue that the failure was caused by the premature timing chain wear issue. The TSB was written to apply only to 2010-11s, but there are some ?12s that also exhibited this issue and were repaired under warranty (mine).
2012 Equinox 2.4L 1LT AWD, black, 80,000 miles