OK, his judgment as officer from Baden for the Prussian artillery in 1813-1815 is hard, other Prussian officers are more nuanced )
On the other hand, his argumentation for the post-Napoleonic period is very consistent and convincing, so I would at least not neglect his professional opinion for 1813-15.
The problem with the Prussian artillery organisation comes in principle down to the number of horses, which are available in peacetime per artileery brigade as long as there is no other institution fro officer training. The French organisation mirrows indeed the Prussian brigade structure in the 1830s in number of bats, number of batteries and overall number of guns. However, I have not found any source yet, which compares the number of horses, which could make the real difference, if you believe Müller.
Greeting from Graz!