Does this advice still apply to ground pours?
I can't say for sure, but I imagine the typical ground pour will effectively
short together everywheres all of the analog and digital grounds on your pcb,
IOW do the exact opposite of isolating the analog cktry from the digital :-(.
Maybe you can specify out-of-bounds areas for the pour.
I've seen the octopus configuration in datasheets, unfortunately, I
wasn't able to do it for this board because space is kind of limited
Actually [forgetting about the ground pour problem], you can do this on your
pcb by physically separating the analog from the digital cktry [as you've already
done], and then keeping the ground traces for the 2 parts completely separate
except for a single-point connection at the cpu chip.
Associated with this, you would also want to keep the ground connections
of your wiring external to the pcb separate, IE, don't mix ground connections
to analog sensors with those to digital devices.