Submitting the description as a bug instead of an issue with the advancement mechanic, given that MC-269856 was labeled as a duplicate. This is related to MC-15729, which was marked as "Working As Intended" (WAI) by @unknown, who does not appear to be a Mojang employee; thus, that ticket may warrant reopening. If MC-15729 is indeed intentional, the description requires correction. Currently, it states "Smelt an Iron Ingot," despite the advancement being attainable through various methods such as finding iron ingots in loot chests, defeating iron golems, or zombies.
MC-270538
The "Acquire Hardware" advancement description states that you need to smelt an iron ingot, although it can be unlocked simply by obtaining iron ingots through any means
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This could be intentional, due to the fact that above smelt an iron ingot, it says acquire hardware, which means that you just have to actually acquire the iron ingot rather than smelting it, they may use smelt as an example for the achievement. But I still can confirm this.