Most of the points raise are simply wrong.
> 1.) too much corruption within the military. also no real war experience for 40 years
China has corruption, yet is able to modernize and build up the military at a pace exceeding the USA's, which spends at least 2x more.
> 2.) not enough oil to supply all the ships needed for invasion. look at how Russia's column of tanks failed in the early invasion of Ukraine.
China is one of the largest oil producers in its own right. It extracts around 4 million barrels a day. The rest is imported, but primarily used for cars -- China's industry and rail networks do not rely primarily on oil. Due to China's transition to electric vehicles, they may have hit peak imports of oil.
During the US Gulf War, even with the tyranny of distance, the DoD used about 400k barrels a day: "Even during the peak of US military operations in Iraq and Afghanistan and “normal” training activities and force movements, the Defense Department’s daily average fuel use was nearly four hundred thousand barrels per day—an amount equal to slightly more than 10 percent of China’s domestic crude-oil output.38" [1]
China produces about 4 MILLION barrels a day, which is 10x 400k barrels. Also, China would be fighting on the front door step.
3.) China is broke and you need money for a war against US and Japan.
China has MULTIPLE TRILLION dollar funds. Did I say MULTIPLE? [2]
Plus, there's the annual TRILLION dollar trade surplus.
4.) China imports most of its food and oil
China imports a lot, but they are self-sufficiency on a caloric basis. The oil imports are primarily for cars. The country doesn't rely on oil for industry.
5.) Taiwan has very advanced anti-ship missile systems, homegrown and from US. and once a ship is sunk near the landing, that then prevents other ship from landing, basically piling up ship corpses.
Read the Japanese government's assessment: "China’s military has the capability to land ground forces on Taiwan within as little as one week after imposing a naval blockade on the island, according to a Japanese government analysis of Chinese military exercises conducted last year." [3]
[1] - https://digital-commons.usnwc.edu/cgi/viewcontent.cgi?articl...
[2] - https://www.amazon.com/Sovereign-Funds-Communist-Finances-Am...
[3] - https://japannews.yomiuri.co.jp/politics/defense-security/20...