Back in 2020, Blizzard noted their removal was an unfortunate side-effect of Shadowlands systems changes but they hoped to re-add a method to obtain appearances at some point. Earlier in 2022, they confirmed these would not be available at Dragonflight launch but soon after.
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After a long absence since the start of Shadowlands, the Warlords of Draenor crafted transmog appearances will once more be obtainable in Patch 10.0.5.