The guide you used only copies a single file from Sony’s “software binaries for AOSP” in order to address the specific echo cancellation issue.
According to the experiences described in this thread here, this does not fix this issue and does not address the tint / colour-banding issue at all.
The proper way to re-flash the “software binaries” is well documented by Jolla.
When re-reading the discussion thread at GitHub, I have the impression you also have not yet understood the fundamental difference between the “Android base” and Sony’s “software binaries for AOSP”.
Furthermore, as @wetab73 already denoted a few times:
… when having had an “Android 12 or 13 base” installed before flashing SailfishOS onto an Xperia 10 III; Sony’s last Android 12 release for this device is 62.1.A.0.675, the last Android 13 release 62.2.A.0.533.
P.S.: How you backup the complete SailfishOS installation, re-flash Android (e.g. with Emma; either to Android 11 and then update via OTA to the last Android 12 release, i.e. 62.1.A.0.675, or flash Android 13 and update to its last release 62.2.A.0.533) and then restore the backed-up SailfishOS installation is described throughout this thread.
This seems to be the only known way to resolve both, the echo cancellation and the tint / colour-banding issue properly.