Not sure about the carriers but the vessels I've worked on did not have temp sensors on the water cooled bearings. Some systems have inspection windows in the pipework with flapper wheels which should be visible and seen to be spinning in the coolant flow. Temp sensors or not engine room rounds require the watch officer, or team, to use hand held digital thermometers to take temp recordings of all water cooled bearings. Results would be analysed and trends observed.
I imagine as the vessel had only reached Nab Tower before dropping the pick the engineering team were conducting their first rounds after leaving port before declaring the ship good for steady away.
I may be wrong but that's what I've done at exactly that spot on many occasions.