Instead the article starts with two 'theories' substantialism and relationalism. The conclusion is more or less: both have problems.
A different subject discussed are reference frames. Also here there are two types: Abstract coordinate systems or external frames and observational frames. Also here the conclusion is more or less: both have problems.
Regarding the laws of motion both Newton and Einstein are discussed. Also here a more or less the same conclusion: both have problems. The main theme of the book is space and time. Also here the same conclusion: there are problems.
Now comes the main question: Does the article give any solution? The answer is No.
To claim that the solution is 'in the mind' of the people, is no solution.
At the same time it should be mentioned that the subjects discussed are very interesting. Many articles are written about the same subjects and support different opinions.
As I said the prove of the pudding is in the eating. Try to simulate the movement of the stars around the black hole within the constellation Sagittarius A*. The main lessons from such an execersize is: Use one coordination system, consider this frame at rest, use only one clock troughout this frame and consider the speed of light and the speed of gravity as two different physical issues.
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