Comment by Ariarule

They did not, you get the same date range and the same graph shape going to FRED and pressing the "1Y" option, and the series includes the first two months of 2026 so it's 12 months: https://fred.stlouisfed.org/graph/?g=1SGzm

However, the chart settings were actually modified to hide/deemphasize the earlier decline: the the index date was changed. 2025-02-20=100 in their graph, default of 2020-02-01=100 would have the chart start at 64 and rise to 71.44.