This presupposes that patriots are and have always been in control throughout the Biden residency.
What if a big portion of the illegals entering the US were actually South American troops coming for briefing and training for the operation we are now seeing unfold?
Why else would US Mil allow so many young men to "invade"? Also explains flying illegals around the country. Also explains recent blackout of Mil aircraft transponders (as they fly to SA).
Disclaimer: I know nothing about military anything. This is 100% pure spitball.

EDIT: to clarify, my theory posits that foreign troops are being trained in America for ops in their respective homelands.

Also, u/1776forever1776 had some important info that rains on this parade, but I'm more interested in truth than in anything else.

This theory does not account for the established human trafficking networks run by the drug cartels and CIA. The surge in activity continued after Biden was sworn in, I can speak from experience, crimes are being committed at the border at an increasing rate.

The Biden admin is actively supporting the movement of illegals. There have been several surges since January 2021.

https://www.dailywire.com/news/biden-admin-is-paying-illegal-immigrants-and-sponsors-for-their-travel-to-settle-in-us-document-shows

This includes using the military to relocate individuals:

https://www.breitbart.com/politics/2021/07/15/tucker-carlson-joe-biden-using-military-fly-illegal-aliens-u-s/

Soros connection as well:

https://www.bizpacreview.com/2022/07/20/biden-admin-gives-soros-linked-group-172m-gig-to-help-illegal-immigrants-skirt-deportation-1263707/