Additional information is required to understand what type of HLS Low Latency is being implemented. The reference to 'community, not the Apple one' does not provide details on what features are desired to achieve LL.
AWS MediaPackage does not currently support the Apple HLS-LL requirements. Though 2sec segments can be used with MediaPackage, the The EXT-X-PREFETCH tag contained in HLS manifests will not trigger any function to provide partial segment data.
Full system latency is dependent on encoding time, origin processing (MediaPackage) and CDN delivery. Any HLS LL delivery would require all components to support the mechanism being used.
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