Joe Biden is overseeing one of the largest cuts in legal immigration in history

Legal immigration to the US has been at around 1.1 million/year for the last 20 years [1]. What are we to make of the fact that after 4 years of a notoriously anti-immigrant presidency, "one of the largest cuts in legal immigration in history" is a temporary, barely 10% reduction? It seems like immigration stays high no matter who you vote for.

[1] https://www.dhs.gov/immigration-statistics/yearbook/2019/tab...