There is no absolute standard of low-tech and high-tech.

The question is how replaceable. That is indirect relevant to iPhone or any small sample of particular items.

The point is, overall, how replaceable is China? How is China ranked on the replaceable country list?

I cannot see any evidences that China will be ranked below top3 (US China EU) in the world's least replaceable country when cutting from global trade.

Nationwide ~1/5th of US imports come directly from China, that’s bumped a little when countries manufacture with Chinease parts but stays well under 1/4th of US imports and ~1/37th the US GDP.

Personally, I get very little directly or indirectly from China based on my shopping habits it’s mostly electronic gifts.