Its not glass empty or glass completely full....but where possible its best to be on side of skepticism as far as possible (i.e start with empty glass and pour into it carefully to measure the true amount there).
That goes for every country in general, and even the very concept of GDP too (it is only an estimate remember).
This is for example how a lot of GDP discrepancy analysis is done, i.e what is the correlations of GDP to certain physical volumes of things vetted from neutral parties (that can be measured with as few or no govt middlemen as possible, like say remote sensing or cross-party vetted data that generally bear good correlation for GDP for other countries).
There is no question China has grown a large deal economically (if you do say remote sense of energy use from space or track vetted trade with other countries etc...i.e 3rd party correlations that lie fully outside of CCP influence and data gathering) but its likely not to the level they (CCP) have on paper (this needs a lot of reading of economists who have followed this subject and charted these correlations and the downstream drift of them).
Especially given there is huge buffer to begin with for all kind of shenanigans (esp when you are the full gamut of every single large organ in totalitarian setup) when you peg your currency as undervalued, have a huge forex stockpile but have massive govt owned/influenced enterprises providing all inputs too....and simply apply western developed institutional data (for fundamentally different setup) as 1:1 for that. It is inherently faulty.
But certain things like FDI in China case are clearly way different situation to other countries FDI norms and definitions, given no one else quite has this HK route at the scale China goes for there....thus it should be taken with large amount of salt. Other things must be looked at before instead.