The 'Chinese' Theory: For and Against

[ololololo]

to make it easier to write down a language whose sounds would not easily map to the alphabet they used themselves...

Is it that difficult?
It is much easier to compare the phonetics of Chinese with regular Latin than with any other alphabet.
It can be assumed that the author was a perfectionist and strove to convey the phonetics of Chinese as accurately as possible, ignoring the similarities with Latin. But... this is again an assumption. In fact, this is the whole Chinese theory.