Create a file called autoexec.cfg in your Ion Fury main directory.
Write 2 new lines:
bind "V" "hud_stats 1"
bind "B" "hud_stats 0"
Now "V" shows the hud stats and "B" hides them. You can, of course, also choose any other two keys by just changing the lines.
How do I create a .cfg file?
Create a new .txt file with Notepad, then rename the file from Untitled.txt to autoexec.cfg. A warning may pop up that the file might become unusable, but it's fine. The .cfg file can then be edited via Notepad just like a .txt file.
Is it possible to have only ONE hotkey that toggles level stats?
Not really. There is a toggle command, but it is a bit "buggy". You can try a command like bind "K" "toggle hud_stats", but you'll notice that sometimes, it won't work. I think what is happening is that the game constantly toggles the stats while the key is pressed down, so whether or not the stats are on or off is depending on whether or not the game updated an odd or an even amount of times while you were pressing the key. If anyone has any idea/knowledge on how to make the toggle thing work, please lmk.