There was a new rule by ITTF in 2009 or 2010, that once a ranked player has gone inactive for 4 months, he/she would be taken off from the ranking list. The ratings are still preserved for a set period of time in case the said player becomes active again before being completely deleted.
Looked up the rules
. Under "5. Deleted Players."
4 months of inactivity and the player would appear on a separate list.
8 months and the player would be taken off the ranking list.
4 years from last appearance on the ranking list would have the player's ranking points completely deleted.
Edited by zeio - 02/12/2017 at 4:20am