When you know that someone is in chat - you need to view the online table:
SELECT * FROM w3t_Online
And see what location that user is being shown as - then this mod simply counts the number of users showing whatever in the online table. The mod is setup to count them if their online location shows 'chat' in the online table. But I'm not familiar with whatever mod you're using. So you'll need to see what the location is reporting in the online table and adjust this mod accordingly.
