Would this be comparable to other single wall DCF tents like a Tarptent Double Rainbow?
No – the Rainbow is a single pole, non-freestanding tent, designed for three-season backpacking. This is a freestanding two-pole tent. It appears to be an exact copy of the Black Diamond Hilight, but in DCF. The Black Diamond line that the Hilight is part of were designed as small footprint mountaineering tents. I’d guess that’s the market for these tents – the Locus tents are remarkably light for what they are designed for, and look really good to me.
The tent in the link below appears to be a copy of the Black Diamond Firstlight (with some extra guy points), which was a pretty faithful copy of the Bibler Eldorado. I had the Firstlight back around 2005. A really good tent:
https://locusgear.com/en-us/products/djedi-dcf-ssd