You'll find a similar argument in any basic econ textbook. Put a cap on prices, then when demand rises for something (which normally leads to an increase in price, all other things being equal), the lack of an accompanying rise in price means there is no incentive to produce more of the good (no incentive for more producers to enter the market), so there isn't a corresponding increase in supply.
Might work okay in China, where the government can e.g. command factories to switch to producing masks, but it means American factory owners won't have any incentive to switch over to producing them.