Yes, that line you highlighted is what does it, and currently in my react-native-run-background-node-process I have that same thing going on. The arm node binary comes from here: https://github.com/dna2github/dna2oslab/tree/master/android/build

And yeah, my current status is trying to compile node-sodium for linux arm. libsodium already has a make system for android, so that's done. Next is to get node-gyp to do the job correctly. Sailing uncharted waters here, no web searching seems to help.