Well VPs traditionally will say the things the President can’t say publicly for geopolitical reasons. Harris may have been saying the things the Biden was thinking but couldn’t directly say while actively negotiating with Netanyahu. Can’t be sure but it’s a more likely scenario than her going rogue against someone on the same ticket as her.
Doesn’t matter now, but more for future reference. If a future President Harris isn’t saying what you want her to say on foreign policy issues but her VP is, you’ll know what’s up.