"Redweek brokerage" is just a broker affiliated with Redweek. I've actually had similar negative experiences trying to buy Marriott resales via those brokers. Their response time and/or inaccuracies annoyed me so much that I gave up on those deals.
But that doesn't condemn Redweek the website. We've bought multiple Marriott/Westin weeks from either private owners or brokers (whose listings are tagged more like the private owner listings rather than Redweek brokerage) and all was smooth and great. I also recently rented a summer 2025
DVC confirmed reservation via Redweek even though I was concerned renters wouldn't find it because of the hundreds of automated rental listings posted by one of the DVC brokers on Redweek. So I'm not giving up on it, since it has both some good deals for buyers (not necessarily DVC) and a lot of visibility for renting (including DVC). If I can get the visibility, the $40 listing fee is totally worth it rather than having to "bump" listings on FB every few days and deal with all the non-serious inquiries.