Except the last one wasn't 6 months ago. It was 3 months ago. They rushed this one out for a reason. Maybe that's why it's a terrible looking transmog.
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They just recently announced they would close down their office in Paris.
Blizzard kept claiming that Warcraft 3 Reforged would still come in 2019 until they stopped claiming that and pushed it back to 2020.
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Almost every mount is taken from an upcoming expansion, if you look at the list of mounts. Often we only realize this after the expansion has been released. Both the Sylverian Dreamer and the Fox mount were clearly developed for Shadowlands.