Of course, I have no idea what happened to this ex-elder but two facts stand out: They asked him to close w prayer after the announcement of his deletion from the list of elders, and the decision involved the CO and was only made public some months later. After 20 some years as an elder, allow me to speculate further, based on experience:
1. Asking him to close with prayer was no accident; it was meant to send a message to the KH that his "removal" as an elder was NOT based on any wrong doing, poor judgment, or any other thing perceived as negative by the JWs. You can take this to the bank.
2. The time lag between the CO visit and the announcement is routine... when the CO visits, one of the questions he is required to ask at the elder's meeting that is usually scheduled the Friday night of his visit is: Are there any deletions or additions to the list of elders or ministerial servants? Any proposed changes will then be discussed with the goal of having the CO concur with said change. The CO writes his report, which includes a note that the elders have recommended such and such deletion (or addition) and stating that he agrees with the recommendation (for specific, listed reasons). This report goes off to the WTS and the body of elders is instructed to WAIT until they get a letter back from "mother" before the announcement is made to the congo. This process can take two or three months.
That's all we know for sure. The reason for this decision is unknown but I would bet the real story is not very interesting or dramatic. He may be ill. He may feel he can't handle the pressure of being an elder (he is 65, old for some people). The information you are getting from him and/or his wife is not necessarily the whole story, but what they want you to know.