As mentioned in my previous post, we're confusing two separate things. The HomeKit architecture upgrade, which you seem to be referring to here and several other posts, has nothing to do with the temperature and humidity sensors. You should still be able to see them on your current devices.
As for the HomeKit architecture upgrade,
Apple did pull the update so you have nothing to worry about right now. When they do release it again, you'll be prompted if you want to upgrade your HomeKit architecture when you open the Home app. It will list all devices tied to your Apple ID and let you know if they are/are not compatible with the new architecture, or if they need to be upgraded to the latest OS version. You can leave it as is, so all devices remain compatible; or if you do upgrade, then you won't be able to use the Home app on the non-compatible devices anymore.