Again, not what the show present him to be.
"it should be of no surprise", except this is something you had to make up to fill the gap left from the show, you have to make up that the dwarves who teach him would not know of a specific alloy because reasons, coming back of how the writing of the show is poor. Because they also took his position of dwarf friend to Elrond.Except he did know about alloys. Making one was an idea that he'd already had and dismissed because it didn't work for his original plans. The technique Halbrand describes is one borne of a lack of certain materials (what he technically describes is making a low alloy steel using nickel), something Celebrimbor wouldn't necessarily need to know about. It should be of no surprise that a lot of techniques concerning smithing were determined by the materials present for the people using them. If the dwarves have abundant deposits of iron and coal then they can make carbon steel to their heart's content.
And what he did in the show that present him as such? what marvels did he craft? Only Feanor craft the Silmarilions as far the show goes, he should not be famous after making the rings? since there was other rings BEFORE the 3 of the elves?You could very well say the best smith was a dwarf since "in the tempering of steel alone of all crafts the Dwarves were never outmatched even by the Noldor", but you'd only be considering a very specific portion of smithing to say that. Celebrimbor's claim to fame (like Fëanor's) was in crafting marvels that weaved together magic and jewelcraft, not in making sharp swords or durable armor.
And i ask again, did the show present him as jewel-smith? if so, then i stand correct, but i didn't saw onceHis work on the Doors of Durin was the mithril (ithildin) inlay. That's fine detail work (not to mention magical) using a precious metal, which is right in the wheelhouse of the best jewel-smith of the time. Again, another faceplant on your part since you couldn't even be bothered to look up what a jewel-smith was in order to realize that cutting jewels isn't all they do.
Or something 'borne" from the show bad writing , butchering of lore that changed things and didn't present him as such, The only nitpicking here is the one you are doing here, treating like this is the only problem, in this episode alone.And again, this is all borne out of your ignorance about the subject as well as your desperate desire to nitpick every detail.
There is lots of bits that make the show worse by being there, "we tried everything! except we didn't this!", "bad guy want to make two? lets make three!!" or the the push softer or whatever that galadriel says, when they are trying to do totally unnecessary.