[kitd]

The BBC article on this says there have been hints from other experiments that support these results, but they need deeper analysis:

https://www.bbc.co.uk/news/science-environment-60993523

The result, published in the journal Science, could be related to hints from other experiments at Fermilab and the Large Hadron Collider at the Swiss-French border. These, as yet unconfirmed results, also suggest deviations from the Standard Model, possibly as a result of an as yet undiscovered fifth force of nature at play.

[T-A]

From the same article:

But the excitement in the physics community is tempered with a loud note of caution. Although the Fermilab result is the most accurate measurement of the mass of the W boson to date, it is at odds with two of the next most accurate measurements from two separate experiments which are in line with the Standard Model.

[londons_explore]

So... 2 experiments + theory Vs 1 'better' experiment.

I know which side I'd bet on.