You misunderstood what your colleague wrote. https://xiaomi.eu/community/threads/migration-of-ota-metadata-source.72743/post-724497
With this current ROM you also have the current "Update" app. You should now receive a notification of a new update.
1, You download the ROM to PC and extract it in PC. (see picture)
2, look at the picture
3, as mentioned in the instructions, your applications and data will be preserved
It's always a good idea to make a backup.
PS:
You may need to install the necessary drivers on your PC.
Download ROM for Mi 10 Pro (cmi): xiaomi.eu_CMI_OS1.0.5.0.TJACNXM_13.zip
How to update:
https://xiaomi.eu/community/threads/updating-to-latest-hyper-os.74312/post-736610
You must log out of your Xiaomi account on the device.
You should also sign out of your Google account.
Only after these actions will the factory reset be made.