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Recall a fundamental postulate of relativity -- that one can not define the velocity of an object except in reference to a frame. Thus, we can NOT say an object is "speeding" unless we also define against which frame we are making measurements.

In an object's own frame, its own mass never changes.

In a frame that views such an object as "speeding," the mass of the object will be greater than it is in its own frame.

Not "mistaken to be" greater, not "viewed as" greater, not "seems to be" greater, not "appears to be" greater. The mass IS greater in that second frame.

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