I did some research looking into datasheets and everything. The chipset in the P2 (MTK6750t) supports a gyroscope, but as far as I can see, there is no-one installed in the phone.
Probably the chipset does a fallback to default values, but because it's not connected, it doesn't show anything.
Here's the Mediatek page: https://www.mediatek.com/products/smartphones/mt6750
According to this page, it doesn't contain the actual hardware: http://www.gsmchoice.com/en/catalogue/blackview/p2/