The branding is obviously weird for a house brand at another retailer. I've seen house brands at consolidators though. But this seems to be available for wholesale purchase by discounters like independent dollar stores.
Wholesale Z12oz DOT 3 BRAKE FLUID 7-11 for local, national and international discount, convenience, dollar, grocery retailers and distributors.
www.glwholesale.com
I'm not sure who makes it, but years ago I remember looking through the API EOLCS directory and seeing that 7-Eleven had its own entry. Obviously they had a supplier and they weren't upfront about who it was, but a lot of retailers used to have house branded motor oil including supermarkets. I even remember once finding Pennzoil PZL-Turbo 10W-30 at a supermarket and buying a case for my dad.
As for 7-Eleven, I see their branded motor oil is co-branded with Lucas Oil and uses the Lucas Oil API license.