The data just looks weird. How do you want to get from -7000fpm to +8000fpm at a GS of between 132 and 93kts (means roughly between 60 and 85kts IAS) ?
The data does not seem plausible at all.
Horizontal deceleration is also excessively high. From 400kts to 60kts in 22s.
Especially the initial deceleration from 400 to 340kts in just about two seconds without a clear trend in altitude change does not make much sense. At FL300 this is pretty surely still far above the stall (bar insane tailwind which I wouldn't expect in that area and flight direction).
From my armchair I have difficulties to fathom a force that would decelerate an airliner at that rate while matching the presented data.
It would seem to match China Airlines Flight 611 profile would it not? Which **could** mean potentially same cause? A repair failure badly disrupting your aerodynamic cross-section can turn into a ballistic trajectory quickly (but not always - see JAL 123).