Mike Harwood asked Les Roberts about the breakdown of the violent deaths. Roberts’ reply:

Yes, all 12 non-coalition violent deaths happened outside of Falluja. (1 Kut, 1 Thiqar, 1 Karbala, 7 Baghdad, 1 Diala, 1 Missan, Note Baghdad is about 3-7 times greater in population than these other Governorates so the rates are not so different)

Bombing deaths:

Thiqar
M5, M2, F22 (one family)
Thiqar (different village)
M27
Missan
1mo. & 6mo. in same households (often there are multiple sons with wives under the same roof — interviewer did not record the gender of the infant)
Falluja
10 girls<12 years, 13 boys<12, M14, 25 adult males, 3 adult women (adult defined as 15–59).

The study itself describes the deaths from small arms fire:

only three of 61 incidents (5%) involved coalition soldiers (all reported to be American by the respondents) killing Iraqis with small arms fire. In one of the three cases, the 56-year-old man killed might have been a combatant. In a second case, a 72-year-old man was shot at a checkpoint. In the third, an armed guard was mistaken for a combatant and shot during a skirmish. In the latter two cases, American soldiers apologised to the families of the decedents for the killings, indicating a clear understanding of the adverse consequences of their use of force.

At most two (one from small arms, one adult male from bombing) of the deaths outside Falluja were combatants. In other words, 95% or more of the 100,000 excess deaths were civilians, so it is not wrong to describe the findings as “about 100,000 civilian deaths”.