Similar to bug 148943, this token is import-only. It needs explicit mention of the fact in the help https://help.libreoffice.org/7.4/en-US/text/shared/guide/csv_params.html Aside, it would be nice if this was taken into account on export, too (subject to a separate enhancement request).
Olivier Hallot committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/help/commit/5a91be35bf16757602aa1600a0c154bd5560b2bf tdf#149846 tdf#149759 Update CSV import Help page