Let's take this for example (https://en.wikipedia.org/wiki/Porsche_919_Hybrid):
"The car's weight was reduced by 39 kg, now
weighing in at 849 kg (1,872 lb) dry and 888 kg (1,958 lb) with driver ballast."
Why not just say
now weighing 849 kg ?
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(of a boxer or jockey) be officially weighed before or after a contest
This has been used to reference the competition that exists between car manufacturers regarding the specifications of their vehicles.
It would be perfectly appropriate to just say 'now weighing 849kg', however this would lose some of the author's intent.
To be officially weighed before competing in a sport, especially boxing or horse racing: Tyson weighed in at 245 lb for the fight.