Turns out sleep/wake isn't working correctly on my system after all :\. I've been testing putting it to sleep from the apple menu. System tries to turn off but then turns back on again right away.
I switched to
@ripe_md's updated fractal SSDT and also did the "Fixing Auto Sleep" portion in the guide and it didn't work. Also unplugged my external sound card just in case that was causing the issue, and still didn't work.
Any insight on troubleshooting this is much appreciated. If this is intended behaviour, then my mistake!