It's misleading information.
Because the unit sales volume of Sony in the ILC market is still significantly lower compared to Nikon.
Sony only has a small advantage currently in revenue, because of more expensive cameras.
But that will not last:
- Canon and Nikon will increase their camera lines also in the mirrorless area = less market share for Sony in the future
- the main reason for decreasing overall sales is market saturation, and that trend will increase.
Also the mirrorless market is decreasing because of the "last camera syndrome". How much Sony AIII users will upgrade to a AIV? Very little.
How much Fuji XT-3 users will upgrade to a XT-4 in the future? Very little.