Years ago it might be a plus, but as modern engines can do 100,000 miles easily with just routine servicing I would see it as a possible sign of abuse or neglect.

Was the replacement engine a brand new engine, a remanufactured engine or a reconditioned one?

A new engine is obviously a brand new engine supplied by the manufacturer.

A remanufactured engine is an old engine rebuilt with all new internals (i.e. new pistons but old engine block) to a British Standard (BS AU 257:2002).

There is no legal definition of a reconditioned engine so a 300k mile example pulled out of a write-off and installed without any inspection of its condition can be described as "reconditioned".