I'm on a Gigabyte Z390 and can confirm the process still works.
The trick for later drivers is to download the v2.8 drivers and patch as normal then rename the patched dll to match the version in the desired driver. eg rltkAPO64.dll may become rltkAPOU64.dll. Then copy to the desired driver install folder and follow the install process. Here's my notes I made for this process.
1) Download Realtek v.2.80 drivers
https://www.techspot.com/drivers/driver/file/information/18007/
2) Download the updated driver you actually want
3) Use the Patcher to patch the files in the v2.80 folder
1) Copy specific patched dlls from v2.80 folder and rename to match existing files in the updated driver install folder, eg RltkAPOU64.dll - remember to backup the original files
2) Run Display Driver Uninstaller to remove Realtek drivers
3) Reboot to UEFI to disable driver signing requirement. Or just reboot if already disabled
4) Remove auto installed Realtek driver via driver manager
5) Install new patched driver
6)Add reg key for DisableProtectedAudioDG
7) reboot
For the reg key copy and save the following to a text file and rename to DisableProtectedAudioDG.reg
Code:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Audio]
"DisableProtectedAudioDG"=dword:00000001