Nope, not true. The bill says the border doesn’t close until the number hits 8500.


 Nope, not true.  The bill appropriates actions for DHS in a multitude of situations.  What you have been lied to about is most likely this:

Among other provisions, the bill provides DHS emergency authority to summarily remove or prohibit the entry of certain non-U.S. nationals within 100 miles of the southwest land border. DHS may exercise this authority if DHS encounters an average of 4,000 non-U.S. nationals within a seven-day period. If the number of encounters reach certain higher thresholds, DHS must exercise the emergency authority. This emergency border authority expires after three years and may be modified by the President under specified circumstances.


https://www.congress.gov/bill/118th-congress/senate-bill/4361/text

https://www.appropriations.senate.gov/imo/media/doc/emergency_national_securi...


 You are correct that the numbers are too high.  You are incorrect about the 8500 must be allowed in before they can close the border.