Discovering the error bars of the system would be a valuable contribution to the experiment. However, obtaining error bars requires significant effort; much more than the experimental raw data gathering. Since the experimenters own the measuring equipment, and the setup is well documented, the equipment can be setup post-experiment in a more controlled environment for evaluation of error bars (for example using the on-demand water heater they bought). Collecting the experimental data first allows the evaluation after the test of whether the investment in apparatus characterization is worth the effort. If there were hints of real excess heat, the investment would be worth the effort. So far, the team has not seen those hints of excess heat even though Me356 set the expectation for what would have been unmistakable sustained excess heat.
If Me356 repairs his reactor and the next test shows real evidence of excess heat, I am sure there will be a lot of post-experiment evaluation of the data acquisition system.