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Question: if I field an eradication maniple (2 units of kataphron destroyers and 1 unit of kastellans) do the troop units count as my compulsory troops or not?

If you mean "Does this detachment count towards the FoC of a bound army?" then no.

The FoC and formations are two different detachments.

Ah as I expected then :( oh well then

Yeah, to make clear - some detachments have force organisation charts and 'compulsory Troops' (like, say, a CAD) and some detachments don't (like, say, a Formation).

But a unit can only ever be part of one detachment at a time.

Of course, you don't need to take any detachments which use Force Organisation Charts if you don't want to. The whole army could be just Formations, for example, and you wouldn't need to take any 'compulsory Troops' at all!