So what?
The Captain ("the company Safety Pilot") chose to fly with the fuel that the company dispatcher - also a supposed specialist - decided was sufficient for this flight.
Many airlines demand an explanation if one elects to carry fuel above tha which is planned.
Most airlines these days treat, and pay, their pilots like 'bus drivers - and so it shouldn't come as a surprise to them when pilots decide to act accordingly.
"
On landing at the primary alternate, the airfield Fire Service had to escort the aircraft to stand, as it was considered possible that there would not be enough fuel to get there."
Again, so what?
As long as the aircraft
landed at the alternate the p.i.c. has complied with all requirements. If he has to be towed from the runway (of the alternate) to the parking spot due to lack of fuel, then he has absolutely complied with all requirements in accordance with the defined fuel policies. And demonstrated a remarkable knowledge of his aircraft's performance.
IMO, this pilot landed with TOO MUCH fuel, if the engines were still running when he got to the parking spot!
