What you get is the exhaustive list of what you are allowed to use (normally linked to what you subscribed for)
Don't be lured by TWS that seems to work differently than Gateway, allowing you to see in the UI news you can't fetch trough the API.
Anyway even with TWS you cannot catch trough the API all you can read, (or I don't know how to do that)
I guess this is for copyright reasons as there is less risk that theses UI display news are "caught and forwarded" by bots, which is what providers are scared by.
FYI:
Once you get this list you should use it to call contractDetails which will give the exhaustive sub list of all feeds for each providers.
In your case it should come out with something essentially? like that (take what is after the ":" before is raw custom log)
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_SMU,'Stock Market Update'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_ALL,'All News'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_STS,'Story Stocks'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_DSW,'Daily Sector Wrap'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_TECS,'Tech Stocks'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_RTB,'Rate Brief'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_FEDB,'Fed Brief'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_WKW,'Weekly Wrap'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_PONE,'Page One'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_TBP,'The Big Picture'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_MV,'Market View'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_WIP,'Week In Perspective'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_BIP,'Bond in Play'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_EDR,'Economic Data Review'
+>IBK? 120: reqInitNews contractDetails: BRFG:BRFG_UPDN,'Up/Downgrades'
+>IBK? 122: reqInitNews contractDetails: DJNL:DJNL_ALL,'All News'
+>IBK? 121: reqInitNews contractDetails: BRFUPDN:BRF_ALL,'All Briefing.com Events'
