You are unlikely to find a biology paper that doesn't say that.

If it were true there should be an equivalent change in insect population as you move north/south.

Or shifting biodiversity as new species move into a now warmer region, rather than net decline.

"suspecting" is not exactly the standard that I am looking for when making statements of such importance.

And their "suspecting" is certainly nowhere near good enough reason to not draw attention to other things such as pesticides, light pollution and other radio electromagnetic pollution