The government already has plenty of debt on a more local level. I doubt they want to “empty their magazines” on the deflation issue when there’s much bigger issues they might need that ammo for.
The deflation issue isn’t imminent or big yet. In my eyes, the Chinese government is responding proportionally to the size of the problem.
The government is already using money from sovereign bonds to subsidize consumption vouchers, which don't immediately affect price levels. It just seems to me like the government cares about clearing out excess inventory/spur thrifty consumers to buy and not necessarily deflation or increasing the sticker prices of those items, otherwise they wouldn't use consumption vouchers and would instead buy the excess inventory directly at a higher price.