I don't think ASUS can do anything, if you have downloaded and tried to install the latest version from apkmirror and the installation fails then it is certain that Asus cannot do anything because Safetynet can only block from the playstore .
There is only the Tidal side or it is wrong and only they can respond and resolve.
In summary, the compatibility can be (non-exausitve)
1) Automatic according to the compilation of the APK and the playstore detects the resources.
2) The application manifest file has prerequisites and the device does not meet them.
3) the device is deliberately excluded from the list of compatible devices even if it fulfills the conditions.
4) There are a few other cases like Root / Non Root detection for publishers that deny the app to be usable on a root device.
Note, I was wrong about the possible cause of the ram, the test can only be done on the available ram, so 18 (-4or -5) is within the standard values)
Contact TIDAL, only they with access to their play console can respond and provide a solution.