Stromer is a Swiss e-bike company and one of the most expensive e-bike brands on the market.
A better example would be Lunacycle, which sells components for DIYing e-bikes. A 704Wh battery from them costs $550. $781/kWhr. Bafang is another well-known component supplier and sells a 754 Wh battery pack for $600. $795/kWhr.
Those are both 52v packs which are the most 'exotic' on the market at the moment, so there is a bit of a price premium.
In all cases, we're talking retail pricing for complete battery packs, with integrated battery management systems and packaging.
The article is talking about wholesale prices paid by companies buying these cells by the million unit quantity.