I am trying to replace a single pole switch with one that has a built in night light. The new switch requires a neutral for the night light to function.

Based on the previous wiring, it seems pretty clear the line / load, and I'd have to assume the bundle in the back is neutral, given it is not used by either of the switches.

The coloring is kind of confusing to me though, since it is a combo of black and white spliced together. The line appears to be white as well. Is my understanding correct?

Here's a closer look