It looks like you are trying to add tunes from APPLE MUSIC. That won't work as you don't own those songs. ONLY iTunes media that you have bought or added yourself will be able to be imported to Rekordbox.
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my rekordbox 5.3.0 can't import music from my iTunes.
I already check my iTunes settings about "share iTunes library XML with other applications", and already check the tree view about iTunes in the rekordbox, but it still can't import the music from my Mac.

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It looks like you are trying to add tunes from APPLE MUSIC. That won't work as you don't own those songs. ONLY iTunes media that you have bought or added yourself will be able to be imported to Rekordbox.