This is not true. There is now a skill gap. There are countless examples that it isn't about being cheaper. The organisation and optimization of the workforce and infrastructure isn't something we can ignore. The choice of China isn't because it is cheaper, a lot of high-end and even luxury products are produced in China because they can ensure a high-quality manufacturing.
There are other places, as the comment above mentioned, that can produce for cheaper.
Of course it's true.
The US could do the exact same. Many high-quality, sophisticated goods are made in the US.
It's just cheaper to do in China because the salaries are lower and the costs of establishing more efficient business infrastructure are lower.
And since these companies care more about cost than anything, they choose China.