The issue here is that this is a panel error.
Looking at the account I can see a two-way voice call is generated, but an actual alarm code is not being received by the central station when this low battery tamper alert occurs.
The central station is effectively getting a 2-way call with no knowledge of why except a trouble alert which does not generate 2-way calls by itself.
Similar tamper alarm problems with Qolsys IQ Panels were resolved in another case by updating the system to 1.6.2 firmware, and IQ2s to 1.6. You can find instructions to do so here.