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The IAU changed the definition back in 2012 so that 1 au == 149 597 870 700 m exactly, the BIPM then followed in recognizing this value.
Ref:
https://www.nature.com/news/the-astronomical-unit-gets-fixed-1.11416 (doi:10.1038/nature.2012.11416)
https://www.bipm.org/utils/common/pdf/si-brochure/SI-Brochure-9.pdf (latest brochure, specifically Tableau 8)
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