The poverty rate has dropped for the 3rd year in a row and is almost to same levels as pre-2008 crisis.[1] In fact, near record lows over the past 50 years.
I think what you are saying about the data is misleading. Look at the chart.
The reason the poverty rate had a three year drop was because it was at at 10 year high around 15% starting around 2010, and only recently started dropping significantly.
The "50 year low" is very misleading. If you actually look at the graph, the poverty in 1970 was 12.6%, and in 2017 12.3%. That's not a "50 year low", that's 50 years of essentially no progress on the poverty rate, especially when ten years ago it was higher.
If you look at the people falling below 50% of the poverty line (deep poverty), that's had it's ups and downs too, but has had an overall slow increase of rate over the same time frame.
[1]https://www.census.gov/library/stories/2018/09/poverty-rate-...