Apple has recently introduced a set of devices based on a new chip, called M1. This is also commonly referred to as Silicon, or ARM64, from the underlying architecture.
This is a big move, because for many years MacOS ran only on Intel x86-64 family processors, and Apple will progressively replace Intel chips on all new devices.
With BigFix agent version 10.0.3, BigFix has added native support for MacOS 11 running on this new chip, without the need of activating an emulation layer.
The installation package for BigFix agent 10.0.3 for MacOS 11 now contains the binaries for both Intel chip and M1 chip, and will install the correct ones based on the computer where it is being run.
Please refer to product documentation and BigFix Platform 10.0.3 announcement