Muchowsky has inserted a determinate hidden variable into the middle of a causal set of a very complex quantum process and claimed a quantum coup. The hidden variable acts just like an uncertain quantum variable for that one step and so the hidden variable determines the polarization outcome. Muchowsky then claims that this hidden variable shows determinism and not quantum uncertainty.
The quantum outcome of a single photon polarization is the simplest example of Bell's theorem. Classically, a photon always has a certain knowable polarization and a measurement simply reveals the polarization that the single photon always had before the measurement.
In contrast, a quantum single photon can exist in a superposition of polarizations without a knowable single polarization. A measurement reveals one of two polarizations statistically, but does not reveal any knowable precursor polarization for the single photon.
Muchowsky describes a process where a highly polarized quantum laser single photon results in two downshifted quantum photons by a quantum BBO crystal made up of quantum bonds and quantum atoms. Now after all these inherently quantum processes, Muchowsky inserted a hidden parameter and concluded that there is no quantum fairy and so the universe is really determinate and not quantum after all.
Methinks thou doth protest too much...