It does look like a BW frame. That's where I got my hardtail done years and years ago, and it came with pointy axle slabs like that. (I squared mine off) I had them do my frame with a little less space between frame main downtube and rear wheel. (more like stock XS wheelbase) And they also raked the neck just a little for me.
At the time, as I recall, it was pretty much just them, (BW) and TC Bros. I probably would have gone with TC Bros, but they couldn't really do it with the smaller space between frame downtube and fender.
Anyway, I have read disparaging remarks re: Black Widow, but they did right by me, and communicated well and took seriously the specs I wanted. It is smaller diameter tubing than TC Bros, but seems strong, and also it is nice and straight.
I have wondered from time to time where those guys are now.