Ah, okay. I just compared Squishy and Detox code and realized that the Squishy icon is only hidable with FuBar installed, while the Detox icon is always hidable. I think I added that to Squishy some months ago as people accidentially hid Squishy and had no idea how to show it again (it had a different name back then). Search for "Squishy.hideWithoutStandby" and replace "FuBar and true or false" with "true".
thanks, been wanting to hide it for a while ^^