It doesn’t matter when you submitted the applications. If they are being reviewed after the dates listed above for the new limits, then they will be reviewed according to the new requirements. If the new requirements say you don’t need verified status, then you don’t need verified status.
I don’t understand your question. Your new bot accounts are the same as every new user account, ie there’s limitations on whispers, and there’s no way you can get around that. Twitch don’t disclose the details of their measures to prevent misuse, all we have to go on is what many of us developers have experienced and that is that new account have severely limited whispers as a bot, and even older accounts have had significant issues to the point where it’s highly recommend not to use whispers on a bot.