I got the impression that despite using terms like "mission critical", this isn't about the hardcore technical wizardry behind propulsion and safety.

This is a call for developers of the very long tail of logistics related stuff. I'd imagine a moon base would need someone to write the software for schedulers, dashboards, etc. and engineer the parts that interface with and provide non-critical telemetry to those systems. I'm not saying that stuff isn't hard, but it's not anything life or death.

Some of those roles might not even be technical at all and be more about coordinating the human side of those efforts.