Genomic archives grow faster than decompression keeps up: the European Nucleotide Archive holds tens of petabytes of fastq.gz, and gzip is fundamentally sequential. GPU decompressors (nvCOMP DEFLATE at ~50GB/s on A100) decode whole files with no random access; CPU genomic tools (CRAM, samtools) support region seeks but only at CPU speed. We extend ACEAPEX, an absolute-offset parallel LZ77 codec included in the official lzbench 2.3 release, with three contributions absent from our prior work. First, a full device-resident GPU decode pipeline (entropy and match resolution both on-device) reaching up to 260GB/s on FASTQ, closing the match-phase-only gap of the earlier paper. Second, position-invariant random access with a compact coordinate index: an arbitrary read decodes in 0.362ms, ~6x faster than warm samtools faidx, with a read-to-block index 6.3x smaller than a .fai. Third, a range-decode strategy that decouples output size from VRAM, sustaining 165.7GB/s on a 50GB genome where whole-file decode runs out of memory. All results are bit-perfect. We also measure Meta's open DietGPU ANS on H100 at 592GB/s decode, faster than the proprietary entropy stage we currently use, showing a fully open high-throughput stack is viable. Code is MIT-licensed.

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