Not really Tom.
Bob the oil guy seems reasonable but his mate is a bit suspect.
His very opening paragraph is at the best misleading and at worse wrong.
The original Babbitt was Sn:Sb:Cu but being patient was largely replaced by the Sn
b:Sb which have a different microstructure to Issacc's original castable bearing.
Much latter on when we started to make them from scrap metal there was some copper contamination & they found small amounts of Cu were an advantage to the Sn:Sb
b base metals
AFAIK the only babbitts that use copper were railway bearings which were cast in place and because of the much higher pouring temperatures are limited to large bearings that can be cooled
When we started to make slipper bearings then the Cu type babbit material became popular because the actual bearing was very thin and made externally to the journal that it was being used on.
However metallurgist do not consider Sn
b:Cu alloys as babbitts as they have a different microstructure to the Sn
b:Sb alloys
So when some starts with a parragraph that is a bit dubious it makes one a little iffy about the rest of the content where ones expertise is not as extensive.