actually, it seems that tight monetary and prudent fiscal policies has been Xi's default position. He last attempted to deleverage in 2017-18, made limited progress, but had to reverse course as a result of the trade war and virus. Now that China is in a stronger economic position in comparison with everyone else, Xi may feel tempted to turn up the heat again on big money in China.
This is probably one thing that he and Li Keqiang can find common ground in. Xi wants to squeeze big money because of their potential to subvert CCP rule, Li wants to squeeze big money because they take all the bank loans away from small businesses. I suspect some of the defaults by SOE's were by design, to assuage the idea that SOE's are safe haven for liquidities not due to market qualities because they are government-backed.