Yes, with Shanghai they have proven that even with a >500,000 case-count and Omicron BA.2.2 they can still bring it back to zero in just two months. This has further emboldened them on the current path. The loosening of quarantine rules is simply an admission that border controls are never going to be water-tight, so as long as they're ready to mop up any inevitable leakages it is possible to lower the entry barriers slightly.