The "Block of the Week: Deepslate" post has this statement:
Mine it [deepslate] out with a pickaxe and you’ll get cobbled deepslate, which can be smelted back into deepslate in a furnace or blast furnace.
You CANNOT smelt deepslate with a blast furnace
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This issue also needs to be fixed in other languages' website.
For example: https://www.minecraft.net/zh-hans/article/block-week--deepslate
Confirmed: https://www.minecraft.net/article/block-week--deepslate