The "just" basically comes down to somebody having time and motivation for it.

Everybody can volunteer to support or start contributing to the mod - it does not always have to be the same people working.
Please trust us that we modders are not lazy - we work already a lot on this project in our spare time.
Especially in the last 3 weeks some team members spent 4+ hours of additional work after having already worked for 8 hours in their job.
So please be a bit careful about using words like "just" or "a bit" if the effort you are talking about is not your own.

This small "just" may make the difference between a 12 hours work day and a 13 hours work day ...