This is an important issue that could use an updated data point (DP).
In the United Airlines forum thread linked to above in Post # 4, back in June 2021 there was a copy of documentation (see Post # 94) that suggested no expanded award availability or reduced award levels for Gateway Card holders.
Yet in the very next Post # 95, a commenter thought he or she still had it. See also Post # 99.
Reliable current information would be greatly appreciated.