Vg chartz has it at 48.8m at the end of 2019. Even if you look at statistically, over 48m is anything from 48.00...1 to 48.9999..., so it's more likely to be under 4m than at or over.
You going with vgchartz number? If its closer to 49 million nintendo would and should announced over 48.5 million. Im assuming its under 48.5 million sold.