yes these exploits are still functional.
however, HackMii Installer is not working at the moment. We need to wait for Team Twiizers to release an update.
Also, Trucha Bug Restorer or other apps [such as dop-mii and pimp my wii] which use code from Trucha Bug Restorer are non functional. TBR is essential to downgrading and installing patched IOS to allow for other apps to run.
if your wii was already hacked [properly] and you updated to 4.3 then you could still run custom channels, such as USB Loader GX and play games using IOS250.
if your wii has a vulnerable boot1 allowing the installation of BootMii/boot2, and you already [prior to 4.3] have the updated boot2v4, then you could run RestorMii and perform a NAND restore and your wii will return to the same state as it was before the update was applied.