So Toshiba's entire pitch is basically " We invented what is basically an SLC SSD, look how much better it performs vs our terrible QLC and spinning disk HDDs"?
Oh, but you can also pair their fancy new not-SLC with QLC? Who knew this was a new innovation instead of something that is absolutely necessary to make a QLC drive meet basic functionality expectations for low-quality consumer drives ... Neat.
If their pseudo-SLC was really that much better, they would be comparing it to other versions of SLC and 3D Xpoint, instead they feel the need to compare XL-buzzword to the worst-performing NAND ever manufactured.