they said 492 were either reported
Are you using theocratic war strategy?
When ARC investigated 1006 they found in some cases there was insufficient evidence or "the matters had already come to the attention of the police". This does not change the fact WTS did not report those 1006 cases.
If WTS hide a case sometimes there is really no sufficient evidence of child abuse. but it does not mean the WTS is correct when they hide it. It is role of police to investigate the matter.