Using this mod, I have now acid neutralization but no steam engines. So I can make steam but not get power from it. Based on the mod description, this is supposed to be a mid game option, yet looking at the tech tree I have to land on either Nauvis or Gleba to unlock steam engines. Since this is a conflict with the intended mechanic described in the mod, I am reporting this as a bug.

Just realized I was looking for Steam Engine, but there is Steam Turbine available on Chemical, so maybe that's fine?

Yes - you skip the steam engine and go directly for the steam turbine, since the acid-neutralisation steam is hot enough for the steam turbines.