It’s joyous in one manner. His argument is that whoever pays you necessarily, without the possibility of refutation, biases your findings. Therefore, anyone getting paid cannot possibily be independent or unbiased.
As Christy points out, this does indeed mean that everything Ritchie writes must therefore be biased by whoever has paid him to write it.
In fact, rather more so that the person he’s attacking: they at least have the multiple layers of university, department etc between them and the cash. Ritchie receives his directly.