I am fairly certain it was her flavor text, once you had finished the quests with her, how sad she was that after the gurubashi fell under the sway of hakkar, leaving them in ruins and the drakkari following in the amani footsteps and abused the loa and doomed themselves in the process.
I could be wrong though it has been several years after all.
Another interesting development would have been Sylvanas learning about and interacting with Bwonsamdi, seeing him as her ticket out of the void, starting to serve him and as a result truly respecting vol'jin as warchief.
Thus opening Loa worship to other races.