Um... a bit confused here. The link from slushpool.com (see bottom of page) to it's maintainer Braiinz is to http://www.braiins.cz/.
You're providing an entirely new domain - braiins-os.org - and that too from a newbie account.

How do users trust that you're actually THE Braiinz that's maintaining SlushPool? Maybe a linkback from http://www.braiins.cz/ would help?

Frankly, with the number of scams going around, I would seriously think twice about installing non verified firmware, from a new source, on my antminers. Been bitten once already.

EDIT: The site is genuine. There's a press release on SlushPool as mentioned by @sarcheer a few posts down.