Command line to run a wp-cron.php on Bluehost
Try using wget.
wget -O /dev/null -o /dev/null "https://www.domain.com/wp-cron.php?import_key=*****&import_id=9&action=trigger
It's what I use on my sites.
For troubleshooting try visiting the URL yourself. If that doesn't work there's either a problem with the plugin, WordPress or Bluehost.