I don't understand the help text in 'bufhidden'

Neovim
1 
This option specifies what happens when a buffer is no longer
displayed in a window:
  <empty>	follow the global 'hidden' option
  hide		hide the buffer (don't unload it), also when 'hidden'
            is not set
  unload	unload the buffer, also when 'hidden' is set or using
            |:hide|
  delete	delete the buffer from the buffer list, also when
		    'hidden' is set or using |:hide|, like using
		    |:bdelete|
  wipe		wipe out the buffer from the buffer list, also when
		    'hidden' is set or using |:hide|, like using
		    |:bwipeout|

I don’t understand what the second half of the sentences mean: “also when …”.

2

Wait, is that supposed to be “even when” or “even if”?

Edit: meh, it is. You can delete this post if you want to.