You're neglecting the fact that not everyone gets stopped, people do visa overstays, etc.
We don't know what the true number is and that's part of the problem. If we're letting an unknown number of people in we aren't controlling for housing demand. All we have hard data on are how many are added to the immigration court backlog.
> We don't know what the true number is and that's part of the problem
We have a pretty good idea, but it doesn't mostly come from border encounter tallies like the onrs you've cited.
> If we're letting an unknown number of people in we aren't controlling for housing demand.
Except for a sharp drop during the pandemic and a rebound to nearly the prior level afterwards, the illegally-present population has been basically flat for years, and on a longer term declining since, IIRC, the mid-late 00s.
We don't know what the true number is and that's part of the problem. If we're letting an unknown number of people in we aren't controlling for housing demand. All we have hard data on are how many are added to the immigration court backlog.