Let's remind that full-on opening of the market was not what the west promised, but it's what they pushed for once the reforms passed a point of no return and they wouldn't take "no" for an answer. Propaganda is what won the cold war.
But let’s look at other ex-Soviet countries. Territorial quarrels and dumb nationalism were unthinkable back then. Look at Azerbaijani and Armenians, ethnic Ukrainians and Russians in Ukraine, Georgia...
USSR could've easily continued its existence if it went full "North Korean." Union's army had no problem to force populace to eat grass in case of a complete economic collapse.
I attribute the single most important contribution to Union's collapse to US funding exchange visits for hundreds of USSR's senior officials, and completely nullifying their will to struggle: https://news.ycombinator.com/item?id=24728237
The very same thing has happened to China, and Xi is trying hard to undo it.
His message of absolute committment to, and inreversability of "opening up" don't mean anything to 99% of ordinary citizens.
Whom he addresses these messages to are not ordinary Chines, but elites whom he tries to convince to the best of his abilities to not to drop the ball on him, and the system.