I am in no way defending them when I point out that this instruction is over 20 years old and may well be different now. This is from "Sheperding Book " 2019...
"When an individual who has been accused of child sexual abuse
(established or not) moves to another congregation, two elders
from the congregation the individual moves from should imme-
diately call the Legal Department. The elders should be prepared
to provide the name of the new congregation, if known. This
should be done even if the individual is disfellowshipped or is in
prison and is transferred to another facility or is released. The
Congregation Service Committee should not send any informa-
tion to the new congregation until after receiving legal advice
from the Legal Department and direction from the Service De-
partment.
27. When the elders are informed that an individual who has been
accused of child sexual abuse (established or not) has moved
into the congregation, two elders should immediately call the Le-
gal Department"