It is. Overseeing refuelling on a loco turnaround is often simply impossible and imo completely pointless.
Not the 'rules' above are not in fact rules at all, but guidelines.
The Aircraft Commander, should....where possible
The ground engineer (or the equivalent supervisor of refuelling externally) should:
Should, not must.
Where possible...
Thus these itams are advisory, not mandatory but it is clear that one would have questions to answer in the event of an unnoticed spillage or a fire if they were not complied with.
In my recent loco it was assumed that the despatcher was responsible for this duty as it was impossible for turnarounds to be achieved if flight deck wasted their time on it.