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Going beyond 10/5 would "allow additional states to reach the 99% completion rate goal and for better completion rates in hard to count areas such as tribal lands." It would "preclude meeting the 12/31 date, but furthers the goal of a complete and accurate 2020 Census."

https://twitter.com/hansilowang/status/1308483992103026688
Per Al Fontenot, a top Census official, as the census approaches the end of data collection, they're facing "major challenges" from nature. He notes that the western states affected by the fires at least had some of the highest rates of enumeration before the fires.
