ET Hitboxes?

Sometimes when you look at some sites you see images poping up about the hitboxes.
They are nice but are they for real?

I mean how can someone cap so nice shots of the hitboxes?
is there a command for it to show them if it is wtf is that command then.

If you got some info about it let me know.

PS: saw a command for CSS sv_showhitboxes but don't think it will work in ET Pro.

Greetz,
BrCh