In the video "Poor Chinese Girl eats RATS" (which is from the same source as the one deriding China for declaring itself a "developing country", FWTW) it is said that:
their blustering of lifting all these 1.4 billion people out of poverty. It's just marketing! It's nonsense! It was achieved simply by lowering the benchmark of what it is considered to be poor. So, in China if you make more than 90 cents a day you're no longer considered to be impoverished. [...] It's simple, you're not poor as long as we lower the threshold for being poor. So you were poor before we did that.
Did China make such a claim? And was it achieved mainly by lowering the poverty threshold?