Admittedly, I can't help but look at the LA2028 Olympics, and the 7 year gap that Comcast has now (As if I recall correctly, they were set to be a media hub for international news outlets covering the Summer event).
I can see a scenario to where with the increased time, Comcast/NBCU are wanting to maximize the back end of the lot, to upgrade everything they can to make things efficiant and seamless for everyone involved. From NBC, LA, IOC, and all the international groups going to be spending time there.
May also help give the chance to allow for the left side of the lot, the current "Front Lot" to then be earmarked for future expansion of Universal Studios Hollywood. Also gives Comcast the ability to ensure that nothing can go wrong during that time.