Yes, but this thread is basically not about the Sony Software Binaries (note that there is no such thing as “aosp software binaries”), even though some people regularly deviated into this topic, apparently because they do not comprehend the difference to …
It is about the Android base over which SailfishOS is flashed. This can make a significant difference, because along with the Android updates Sony deploys various firmware updates, which are stored on separate partitions on internal mass storage (“eMMC”) and thus are unaffected by flashing SailfishOS.
For reflashing the Android base, one must use Emma and start right from the beginning with updating Android to an appropriate release, flashing SailfishOS etc.