Skies
Bob-omb
They are backing the reasoning for not being at E3 -- which would mean they have heard similar that Nintendo is skipping on E3 due to a light second half lineup. They never said nor imply they have direct knowledge of the entire lineup.
So it's just "we also heard this". That is not exactly what comes to mind with corroborating. Usually that is to confirm, validate, or support. As in additional evidence.
For all we know VGC and IGN are hearing things from the same source.