The marketing text is just marketing, the reality is that with custom video modes you probably could squeeze two 1080p 144Hz monitors into that one, with standard video modes at 142 Hz.

The data rate required for 165Hz is 9.26 Gbit/s this requires a DisplayPort 1.4 capable MST hub.

https://www.amazon.com/aegis-DisplayPort-Splitter-Portable-Thunderbolt-Compatible/dp/B093YZRMH1 looks cheap

https://www.amazon.com/Cable-Matters-201355-BLK-Computer-Docking/dp/B085VLPYDR has bonus USB 2.0 ports for not much more.

If the laptop is AMD then https://www.monoprice.com/product?p_id=44116 is very likely to work and give you high speed data, if it is Intel then I would be very curious whether it works -- do understand there's a chance it won't.