The "trench" does not appear "well marked" in the photo (unless they were not supposed to be on that whole apron at all). OTOH, I don't see a taxiway marking to be followed either. Was the plane where it was supposed to be? If so, the airport has some answering to do. If the crew were taxiing out of bounds, the crew (or marshaller/follow me) have some answering to do.
We had a DC-8-63 do exactly this decades back. The ground was too soft underneath the pavement, same result. It had been marshalled across an area of apron not approved for that weight. It was three days getting it dug out though....