If you read that page, you find that UCSC points to the "analysisSet" because it doesn't contains haps/alts/fixes and that directory points to NCBI, because they have already precalculated indices: https://ftp.ncbi.nlm.nih.gov/genomes/all/GCA/000/001/405/GCA_000001405.15_GRCh38/seqs_for_alignment_pipelines.ucsc_ids/
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