So, you're surprised that classified information was clearly mishandled and that the Trump administration would make an attempt at CYA by stating the information was unclassified? At an absolute minimum, the convesational information in that discussion iss CUI, but just looking at what's in the first post, I'd say that info is TS/SCI due to the risk it poses to national security, operational success, and force protection.
The mission type "trigger-based", means it's tied to real-time intelligence (ISR), as well as if the "known location" of the target is (I'd say IS not IF) based on NSA SIGINT, CIA HUMINT, or satellite imagery, so the intelligence would definitely be TS//SCI. However, since the sources aren't revealed in the chat the admin could say this was basically sanitized info and get away with TS Collateral.
This administration had better get Hillary's name out their mouths. ...and shame on the journalist for making it public.