Yes. That is what an order of magnitude means. But that is not what magnitude means - it has its own definition separate from that one particular usage: size. Try reading that in the context of what I wrote:
>Meanwhile, NASA tests a related apparatus and does in fact detect thrust, but of a -magnitude- size inconsistent with the theory upon which it is constructed.
I say nothing about orders of magnitude. I only refer to the size of the effect, and note that the size is inconsistent with the theory. The fact that the magnitude of the thrust is inconsistent with the predicted magnitude by three orders of magnitude is especially damning, but even if the actual magnitude was only 30% lower than predicted it would still indicate a likely problem with the theory. Legends are made by fixing smaller discrepancies than that with a completely new theory.
Just to reiterate
magnitude /magntood/ noun
the great size or extent of something.
"they may feel discouraged at the magnitude of the task before them"
synonyms: immensity, vastness, hugeness, enormity; size, extent, expanse, greatness, largeness, bigness
"the magnitude of the task"
antonyms: smallness, triviality
2.
size.
"electorates of less than average magnitude"
a numerical quantity or value.
plural noun: magnitudes
"the magnitudes of all the economic variables could be determined"
3.
the degree of brightness of a star. The magnitude of an astronomical object is now reckoned as the negative logarithm of the brightness; a decrease of one magnitude represents an increase in brightness of 2.512 times.
Not that not one of those made any reference to a power of ten - the closest is the usage in astronomy where it represents a power of 2.512