Man pages matching name io::uncompress::unxz in section 3pm:

IO::Uncompress::UnXz.3pm.en	debian 10 / libio-compress-lzma-perl
IO::Uncompress::UnXz.3pm.en	debian 11 / libio-compress-lzma-perl
IO::Uncompress::UnXz.3pm.en	debian 12 / libio-compress-lzma-perl