They sound like random letters stringed together rather than any attempt to build an actual brand.
The factories usually ship directly to Amazon warehouses and it is also fulfilled by Amazon (FBA).
This particularly brand (BTLOS) will come up on searches similar to "good Chinese carbon wheel brands" with reviews on FB, Reddit, etc.
And the cycling industry has had Chinese brands making inroads for a decade or more. So, Winspace, BTLOS, and a few others have come to be known entities (some do sell through AliExpress, some direct from their own site). And there's a niche group of product testers on YT or similar that review these things.
I assume there are analogous items in other hobbies, but I can't speak to any specific examples/brands.