With all of the sources listed, there are no footnotes to explain where he found some of what he wrote about.
There are some glaring errors, artillery wise, starting with Galileo and the parabolic trajectory of artillery rounds. The trajectory is not a parabola as the trajectory is not symmetrical. When the round reaches its maximum ordinate, it starts to fall a shorter distance from the trajectory to the max ordinate. In short, Galileo was proven wrong.
Further, the author leaves out the development of field artillery beginning with the Prussians in the 1740s, continued with the Austrians in the 1750s and the French in the 1760s. The British artillery development, as an arm, was significantly behind these developments which is highlighted by a comment by Ralph Willett Adye on the Gribeauval System.
I tend to doubt the expertise used to write this article and I don't believe that it can be used as source material for further research.