Earlier quoted context omitted.
What metric are you considering? The rendering tests show the 2990WX to be both faster and cheaper than the i9.
Slightly faster yes. Cheaper? For now. Price is elastic. The i9 could be priced at any price point because there was no competition until now. Do you think Intel will keep it overpriced for long?
Intel on the other hand needs to manufacture a monolithic CPU that not only is fault free in enough cores, but performs well. That's harder and yields are way lower.
80% yield on a 4 core block is a 16.7% yield on a 32 core block - and that's before binning