Most of the advice is good, though not particularly different from an advice you would give about writing any essays. This one though:

> Avoid placing equations in the middle of sentences. Mathematics is not the same as English, and we shouldn’t pretend it is.

I don't know what to make of it. Equations are supposed to be part of sentences, and mathematical equations are compact expressions of relations. For example, the sentence,

    Newton taught us that force is equal to mass times acceleration, where both mass and accelerations are inertial quantities.

can be compacted as

    Newton taught us that $F=ma$, where both the mass $m$ and acceleration $a$ are inertial quantities.

This becomes more useful with more complex relations. Generally, hanging mathematical expressions (those independent of sentences) should be avoided to the utmost in any technical report.