Geya’rah (daughter of Durotan, most famously known for rebelling) dropped “honor = loyalty” amongst a group of people who not three years prior had a mass rebellion against their Warchief - not to mention other rebellions against Kael’thas and Elisande from members like Lor’themar and Thalyssra for example.
That does not sound like someone who is informed about the whole Horde plot.