This information appeared in the WT which was the same WT the Japanese brothers would have received...
4/15/91 WT page 23 Imitate God's Mercy Today ***
13 In recent times there have been cases in which an elder happened to meet a disfellowshipped person. Where appropriate, the shepherd briefly outlined the steps to be taken for reinstatement. Some persons like this repented and were reinstated. Such joyful outcomes indicate that there may be disfellowshipped or disassociated ones who would respond to a merciful approach made by the shepherds. But how might the elders handle this matter? Once a year at most, the body of elders should consider whether there are such persons living in their territory. The elders would focus on those who have been expelled for over a year. According to the circumstances, if it is appropriate, they would assign two elders (hopefully ones familiar with the situation) to visit such an individual. No visit would be made on any who evidence a critical, dangerous attitude or who have made it known that they want no help.—Romans 16:17, 18; 1 Timothy 1:20; 2 Timothy 2:16-18.
14 The two shepherds could telephone to ask about making a brief visit, or they could stop by at a suitable time. During the visit, they need not be stern or even cool but should warmly reflect their merciful concern. Instead of reviewing the past case, they could discuss Bible texts such as Isaiah 1:18 and Isa 55:6, 7 and James 5:20. If the person is interested in returning to God’s flock, they could kindly explain what steps he should take, such as reading the Bible and publications of the Watch Tower Society and attending meetings at the Kingdom Hall.
15 These elders will need wisdom and discernment to determine whether there is indication of repentance and whether a follow-up visit would be advisable. They should bear in mind, of course, that some disfellowshipped persons will never be ‘revived to repentance.’ (Hebrews 6:4-6; 2 Peter 2:20-22) After the visit, the two would give a brief oral report to the Congregation Service Committee. They, in turn, would inform the body of elders at their next meeting. The elders’ merciful initiative will have reflected God’s view: “‘Return to me, and I will return to you,’ Jehovah of armies has said.”—Malachi 3:7.
So the Japanese brothers had the information, whether they chose to apply it I don't know. I assume so since they seem to be much more obedient that those in the US.