Myna birds and stick insects

In the news recently were reports that the eradication of the introduced myna birds on Atiu in the Cook Islands has led to an increase in the number of coconut stick insects (which I assume to be Graeffea crouanii). I can't seem to find anything in the published literature about this, but Gerald McCormack is a well known natural historian of the Cook Islands, and has previously photographed a myna bird eating stick insects.

(C) Gerald McCormack source

Further reading
PestNet: Mynas, coconuts, stick insects & Oryctes, Fiji