No because something may roll out of that open door and hit one of them in the head. They should all be wearing hard hats and eye pro, or close the door then their fine.
No it isn't safe, the guy on the left shouldn't be using a mobile phone on a work site ....even if it is to chase up the fluoro vests/PPE for his crew, a Stop/Go sign to ensure adequate traffic control & an operator with working at heights certification to drive the backhoe....................so much for a risk assessment....