There was a dispute involving LTO-8 that just recently was resolved, so LTO-8 tape should now be available in the US. I wasn't following it closely, so I can't give any real insight, but it explains the wording.
https://www.google.com/shopping/product/10502190238469223139
Google says
"HP LTO-8 Ultrium, 30 TB, RW Data Cartridge Tape. Exhaustively tested, HPE LTO Ultrium cartridges meet all your demands for maximum reliability when restoring data, offering high storage density, ease of management and scalable storage and backup performance."
TapeandMedia.com says
"1 - HPE LTO Ultrium 8 Tape with a capacity of 12 TB and up to 30 TB compressed capacity."
Here's a 15TB compressed for $63:
https://www.amazon.com/HP-C7977A-Cartridge-Compressed-Capaci...