Not sure if anybody had tried it or if it has been posted before, but you can rewrite new info to the RFID tags that come on creality spools.
I had an empty spool of creality hyper PLA white and a full spool of hyper PLA white on a cardboard spool. As a test I rewound from the cardboard spool to the creality plastic spool, read the spool info, reset the filament to 1kg and hit random for the other info, write it back to the RFID tag and it worked. Read the spool as a full new spool of hyper PLA white.
the amount of filament left on the spool is not stored on the RFID tag, it is determined when the CFS rewinds the filament, it can determine approximately how full the roll is by how many turns it takes to rewind the filament, i doubt the tags are re-writable but if you want to test it try to change the color and see if that works
So, I re-read the filament tag and you are correct, the filament length value stayed at 330, so per your request I did try changing the color from white to blue, saved it, change the color on the screen to green (to be sure it read the correct info from the tag), and it did change to blue.
To be sure it wasn’t a fluke, I again changed the color from blue to dark red and saved it, then changed the color on the app to white, read the tag and it did change to dark red. Finally I changed it back to white, saved it, change the color on the app to green, read the tag and it read it as white again.
So, the tag can be rewritten again, and the app I used was RFID for CFS app and I used my phone for reading and writing the tags, a Galaxy S22 Ultra.