Okay, since you still do not seem to understand any basics of the topic, here are some explanations for you.
We do measure with a frequency of 400 Hz, that means 400 Measurements of acceleration per second.
The accelerometer in our measuring device has a resolution of 0.0039 g, and has a linearity of +/- 0.5% v.E., that means if the actual acceleration is 10 g, we can measure between 10.0503 g and 9.9489 g - which is (I assume) extremely accurate. Combined with low noise this is pretty accurate - of course there are more factors than these numbers, so we claim an accuracy of 0.1 g. But we do not take raw data from the sensor, that would be ridiculous, like I'll show you right now - you might find a discrepancy between official numbers and our measurements.
We do measure according to DIN EN 13814 as far as we can and process our data like we should - depending on the older version and newer version of that norm you either have to add a low-pass-filter with 5 Hz maximum frequency or 10 Hz maximum frequency. We use the newer norm that needs a 5 Hz low-pass-filter.
Here are examples of this exact Hyperion measurement with different filters: No filter, 10 Hz, 5 Hz, 1 Hz
Depending on your filtering method you can claim: "Hyperion has a maximum vertical acceleration of almost 7 g (!!!!)" or you can claim "Hyperion has a maximum vertical acceleration of almost 4 g". According to the older version of the DIN EN 13814 Hyperion would accelerate you with a maximum of around 5.25 g and a minimum of -1.4 g (vertical).
Furhtermore I still don't get your point, where you're claiming -0.8 g (!!) are nothing but floater airtime. Floater Airtime is around the 0 g (vertical) area. -0.8 to -1 g are like you were upside down. If that wouldn't eject you from your seat, you should eat less, to not get stuck in your seat.
I'd love to hear more about our project being bull**** from a guy, who doesn't know how many people are involved and who these people are, without even knowing what equipment or even knowing what software and knowledge was used.