When you disable defcon the text message in #mod-log is DEFCON enabled it should say DEFCON disabled
It works like this in the #defcon channel.
Current message in #mod-log

but a few months ago you can see this behaviour.
Message from 08.08.2019 in #mod-log

code from defcon.py
elif change.lower() == "disabled":
icon = Icons.defcon_disabled
color = Colours.soft_red
status_msg = "DEFCON enabled"
Someone looking into this might want to focus on the last line of this snippet.
When you disable defcon the text message in #mod-log is
DEFCON enabledit should sayDEFCON disabledIt works like this in the #defcon channel.
Current message in #mod-log

but a few months ago you can see this behaviour.

Message from 08.08.2019 in #mod-log
code from defcon.py
Someone looking into this might want to focus on the last line of this snippet.