Its white cause its empty shell. Look at the left side corner of the racket ,next to the stringing machine. Its a yellow string.
If it's an empty holder , why is there white string coming out of it? If you took that yellow packet, I am sure it's already had some string taken out of it. Not a hint of white within it to indicate it is half used.
I remember in the video of xia xuanze Coaching recreational players he was asked if the Chinese players racquets are the same as what you can buy at shops and he said yes they are all the same but when he was asked what strings china players uses and he said Er...we use...oh I can't say. say so maybe they don't all use li Ning