Never mind him. He is just trying to get justification for the massive cost of modernising the US nuclear systems (I think the total cost was 1 trillion dollars...)
That's what happens when you have over 3000 warheads and contractor costs and salaries that are comedic. No, not because of higher quality etc but because doing anything just costs a ridiculous amount there and often the contractors have an entire chain of corruption and dodgy deals. Not that China would be too different but servicing a smaller stockpile is going to make that much more bearable combined with supposed longer lifespan and lower maintenance requirements of Yu Min configuration.
1000 warheads of multi megaton yield is probably what China should aim/keep it at. Delivery and survivability from first strike is more important than getting pure numbers at some point and considering how many warheads you'd like to throw at how many cities? I reckon 1000 given an assumed 50% gone from first strike and 25% lost from interception (reasonable assumption of interceptors), is a lower estimate of what is optimal. Keep it at about 5 warheads for the 25 or so cities that need to be targeted in case of being hit first... assuming another 50% of the surviving ones failing or being off somehow.
Lower stockpile if they're extra confident in delivery and accuracy. No reason really to doubt this unless there are many disruptive technology to counter this, being kept hidden even from intelligence agencies. I'm sure there are other backups. Ain't any reason to be friendly with those who are so damned desperate to destroy you.