For example, PoW does not have absolute finality, only probabilistic finality; BFT has absolute finality, so does Casper FFG. YeeCos Tetris consensus also has absolute finality.
Use of 'absolute' is horribly misleading. There is no 'absolute' in any system which is not fully objective. Casper and all BFT-type consensus designs are subjective by nature.
You are correct that PoW only has probabilistic finality, but nothing else has 'absolute' finality, at best they have finality within the set of tolerances set out by the design, which usually include such things as an honest majority of bootstrapping nodes etc.