[Brightcolours]

Sony also produces smaller bodies, such as the a6000/6300/6500. Those in the price tag of 1000€+ are prosumer, because I don't see casual shooters spending one buck on a camera. We can argue on whether we can talk about lower/upper prosumer segments (like "prosumer/pro"), and it would be ok, but names apart cameras in the 2500€+ segment are not in the same segment as those around 1000€. I don't see people wanting an a6500 or similarly priced m43 or Fuji considering a Z6 or Z7. I'd say Nikon is basically trying to prevent their current customers from being tempted to drop off the wagon.

Sony is not producing smaller mirrorless FF bodies than the A7 line.
The A6000 series is consumer range, the prosumer range is the A7 series. That you as prosumer use the consumer range does not change things (nor does it matter much).
There are also real pros within their segment who use consumer range cameras.