Most likely explanation: PC port was crashing, they disabled optimizations, it stopped crashing. Been there, done that. Drop dead release date approaching, no time to find the root cause. Maybe the PC game already crashes enough that the people who pick up this patch don't notice that it's crashing more now.
Dunno. The forum thread just makes my head spin with naivete. As a former game developer, I'm reminded why I could only ever read forums with one squinted eye open, head turned to the side.