Are you talking about https://flow-browser.com ? I wasn't aware of this project before, but it appears to a new chromium based browser.

The Flow people are talking about when they talk about Ladybird and Servo is https://www.ekioh.com/flow-browser/ which does have it's own engine. It has a similar level of standards compliance to Servo and Ladybird, although it's not open source which puts it in a somewhat different category.