I read the TV trope page of TCB, and I came across this story called The Palladium Wings. Problem is I couldn't find it. Thus this story still exist?

Might have been removed. TCB was a very controversial mlpverse long ago but it died just as quick as it came.

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Tbh it deserves to stay that way. Sturgeon's Law applies heavily to it.

That being said, some of the more recent retakes have been pretty good.

EDIT: By "it" I refer to TCB in general, not the specific story.

You can find it on FiM-Fetch, here:
https://fimfetch.net/story/34641/the-conversion-bureau-the-palladium-wings
Tough, 9 years is a long time period and it seems to be discontinued after 25 chapters.