There's a big difference between receiving an amount of government subsidy, and the government funding almost everything with nearly no budget limits.
The former is definitely true, though China is not the only country engaging in such a practice.
The latter claim needs sources to back up.
If you look at the Chinese chip industry, then you see that a lot of money comes from the private sector. Huawei, Xiaomi, etc are investing a ton of money in semiconductor companies. SMIC got a lot of funds through a stock market IPO. Clearly it's not all government money.
There's also a big difference between investing in an industry with the goal of dominating the world and eliminating competition, vs the goal of becoming a sovereign equal. Why is it necessarily the former, and not the latter?
The reason why the Chinese government invests in many sectors, is because they want to be independent instead of being at the mercy of foreign sanctions. If it weren't for that, they'd happily buy from foreign suppliers because that's cheaper than developing the technology themselves.
There is another documented history: that of the US sanctioning China, preventing China from accessing all sorts of western technology. For example, the US denied China of space technology. So now, China has wholly self-developed space technology. China isn't selling space technology below production costs to kill competitors. China invested in this sector in order to safeguard their access to space. https://www.businessinsider.com/nasa-china-collaboration-ill...
The US forced TSMC to not supply to many Chinese companies, and TSMC isn't even a US company. The US is trying to kill the Chinese semiconductor industry, making it wholly reliant on foreign suppliers. For years, Chinese companies have bought from foreign semiconductor suppliers because those are better. But the US has now turned this matter into an existential crisis, a matter of survival. Is it then any wonder that China, both public and private actors, are now pouring billions into the domestic semiconductor industry?