The reason to send in the PLA would be to increase the level of violence, but there’s no reason to risk the backlash of sending them in when the HK police can do the job too—even if the Central People’s Government were to suddenly decide that live ammunition is needed, they would still be able to rely on the HK police. The deployment of troops is therefore almost certainly, as was noted in the SCMP, a statement of intent as opposed to a sign that there will be a deployment of troops.