By price and power usage those GPUs cannot be defined consumer.
Ok but that's not how consumer-class products work. It's also about support levels and some other assurances.
Also, the price class of the 7900 XTX is completely different than the 4090 being that, based on actual market prices, the 4090 really is out on it's own at a cost of more than 50% higher than the 7900 XTX. Sure, they're both "prosumer" class products, but that still falls in the consumer category and not professional or datacenter.
We're kind of arguing semantics here but the basics remains the same: you're getting one of the most affordable AI training servers for the performance given. Thankfully, there are alternatives to nVidia's AI strangehold, which the pricing really reflects. Now that clever folks will be tinkering with the AMD models and the both ends are working to improve driver quality, it seems to me that both options are very compelling, albeit for somewhat different reasons (price-perf vs. all-out performance and "it just works").