Any item which is labeled as a syndicate item is a syndicate item. Any item which is primarily acquired through an uplink, including stealth items, is a syndicate item.
Limitations
While stealth items are considered syndicate items, crew must identify them as what they are before being able to treat them as syndicate items. This clarification should not be interpreted in any way to allow “checking” items to see if they are stealth items. The conditions under which stealth items can be “checked” is outside of the scope of this clarification.