Well, to be fair, the US could build nearly 10,000 nuke bombs in a year in 1950s, with the kind of industrial power China has now, including nuke industry, the nuke-gap between the two can close in a rather short time.
Actually due to Hu's article, there is one nuke specialist in China, Professor Yang, wrote two articles so far, critizing Hu Xijin like crazy, claimed Hu's article cause trouble to China's policy makers and want to shut him up.
But in the second article Yang wrote, he actually admitted that China has much more nukes than public believed, people should not be overly worried about that.
Also I remember one General from Russia rocket force wrote an article about China's nuke arsenal, on his account, he believe that China current has about 2000-3000 nuke bombs and warheads.
But whatever the number, it is still less than that of the US, althrough not that much, but more importantly, China now still dont have sufficient delivery vehicles that can deliver the nukes to the US.
There are about 18-20 ICBM brigades in China, roughly 200-300 ICBMs now, many of them are single-warhead DF-31s/31As, the SLBM on SSBNs also has single warhead, and JL-2 get a range issue to strike US now.
So at most, China can only deliver about 500 warheads to the US now, China definitely need to update their nuke arsenals, especially building ICBMs like crazy to close the gap.