http://www.rpm.org/ticket/84 has nothing to do with payload support, it's only support for extracting lzma/xz compressed archives.
Here's the patch that added both proper lzma_alone & xz payload support http://lists.rpm.org/pipermail/rpm-maint/2009-March/00237... that rpm.org ended up adopting (where they didn't orginally even plan on supporting the legacy lzma_alone format that others were and are still using).
Posted May 3, 2011 22:44 UTC (Tue) by rahulsundaram (subscriber, #21946)
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Yes, Got the ticket number wrong. LZMA was legacy and author had informed folks that there is a newer and stable format in the pipeline and not to rely on LZMA. Hence the lack of support for it in rpm.org.
Who maintains RPM? (2011 edition)
Posted May 3, 2011 23:44 UTC (Tue) by proyvind (guest, #74683)
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yes, but they now support both lzma_alone (legacy) and xz payload, as was contributed by me after all.. ;)