The important character here is the '>'. This redirects output to a file and overwrites the file. The lrwxrwxrwx will only print an error, but the redirect to the target executable will erase the target.

For example:

  $ echo "asdf" > foo
  $ cat foo
  asdf
  $ lrwxwrwxrwx 1 root root -> foo
  lrwxrwxrwx: command not found
  $ cat foo
  $

So basically, this zero'd out every executable on the system.