Are you not taking into account that the Chinese military can also be quoted *all show no go* when the time for invasion finally comes? By whatever metric you are using for that quote.
Plus U.S. would be on the defensive in Taiwan conflict, unlike in Iran war where U.S. military is on the offensive & has inflicted multitude more damage to Iran than vice-versa, what is holding up U.S. victory is underestimation of how much pain Iran can handle and still doesn't surrender or collapse, along with its ability to block Strait of Hormuz & how vulnerable gulf states are.
Of course that's a possibility. Although it's much less likely because unlike the US the Chinese have invested their resources into what matters, which isn't obsolete bombers and maintaining forever platforms of questionable viability. They invested into drones, missiles, IADS that includes short, medium, long range and ballistic missile defense (as compared to the US basically having near zero SHORAD, because 'muh Air superiority' will 110% prevent anyone from shooting at you...)
The US is looking like clowns because they brought a conventional fighting force to an unconventional theater. They drop bombs and bombs and bombs and somehow all they end up doing is killing schoolgirls. The missiles and drones are flying ultimately largely unfazed. That one of their carriers almost burned down or that their AWACS and tankers are just parked in the open to get blown to bits is just the cherry on top born out of a weird sense of invincibility (drinking their own kool aid). The PLA could fall for similar pitfalls, but: Taiwan lacks the strategic depth of Iran, the taiwanese Military is riddled with PRC spies, the taiwanese as people are much softer than the Iranians, the Chinese and Taiwanese are ethnically very close if not in large parts identical, compared to the Iranian people fending of, in their eyes, foreign invaders from the US and Ivdea. Add to that the fact that neither the entire air force, nor the entire USN could be deployed and you already have the Chinese at a major advantage. Now look at how the USN is deadly afraid to enter the strait of Hormuz. And you think they would operate anywhere near Taiwan against the PLAN, PLARF and PLAAF? All of which directly able to intervene from the mainland? It's all a long way of saying that the entire PLA, aka arguably the largest missile force and the actually largest Navy by number of ships would go up against small Island nation inhabited by more complacent people who would have to rely on a fraction of the US Military to protect them. A force which has showcased to the entire world that they're unable to protect their own assets, the assets and vital energy infrastructure of their allies and inability to open a blockade by a far less capable and sophisticated force. Meanwhile China could let endless streams of missiles and drones rain down on Taiwan while completely blockading it. After that any landing operation can commence if they felt like it.
The ROC must be sweating, the PRC must be laughing and the USA still has to figure out how to finally leave the sand box after 30 years. INDOPACOM is not looking great right now, let's how that is in 10 years from now.
It's kinda hilarious seeing all of the Gulf States getting their vital infrastructure and US military presence reduced to nothing, Israel being turned into a major travel destination for missiles and the US losing assets and bases across the entire region and yet there are still the special bunch that believe the US could beat China in their backyard when they can't even beat an Iran that's been sanctioned since it's inception and was surrounded by innumerable US military presences.