From the dataslate:
"“FORMATIONS
A Formation presents a collection of two or more units that fight alongside one another in a particular way. When you choose an army, you can take a Formation as a special form of Detachment. Unless otherwise stated, you can take any number of Formations in your army, and each is considered to be a completely separate Detachment, regardless of how many units make it up.
Each Formation will tell you what units you need to take and what, if any, options or restrictions apply to the units that make up that Formation. The army list entries for each unit in the Formation (the units’ profiles, points values, unit types, unit composition, special rules, battlefield role etc.) can either be found in the codex corresponding to the Faction on the datasheet, or elsewhere in the dataslate itself."
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There's nothing about not being troops, elite, hq etc. they're a separate detachment, so just as ally troops still count as troops, these too are troop units. They're also listed as troops in their army list entry.
Also - just got a reply from GW digital about adding brood lords and scoring units from the formation. Here's the reply:
Hey Jonathon,
The unit is the same as the one that appears in the codex in all regards, so the unit's battlefield role stays the same as do any options that aren't specifically mentioned as being changed.
- Eddie