You are reading the documentation for DSpace-CRIS 5.x and 6.x as available in the maintenance branches.
For DSpace-CRIS 7 please check the PDF technical documentation provided on GitHub as noted here a specific section is devoted to the ORCID Integration
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The synchronization procedures use a convention to discover which preference are available, see 81953196 Mapping local properties to ORCID below.
The system monitors changes to the researcher profile and linked entities (publications and projects) putting in a queue (the orcid_queue table on the database) the list of objects that it is necessary to synchronize. This is done for the DSpace items via a consumer enabled by default in the dspace.cfg