You mentioned to trust CAF - is this kernel CAF based?
I think that you're confused about what CAF based means.
CAF = Qualcomm. We have a Qualcomm soc, isn't it?
Oneplus made his kernel on top of CAF sources, of course, like any other company with snapdragon chips, so yes, this and every other kernel for oneplus 8 series have a CAF base.