Qrevo Curv 2 FlowX?

Found this link: https://roborock.s3.us-east-1.amazonaws.com/manual/cardAndError/qrevo-curv-2-flow-issues.html

It contains the quick start and troubleshooting guides for the Qrevo Curv 2 Flow and curiously, Qrevo Curv 2 FlowX. I have not seen the latter being mentioned anywhere. Both seem to be identical.

Why does Roborock keep polluting its product line-up with so many variants?