Obama started including those apprehended at the border and turned back. Previously only those caught well inside the interior were counted as “deported”.
Regardless, some real numbers.
Operation Wetback lasted short of a year and resulted in 2.1M Illegals being repatriated. More than half that number self-deported.
So using your 11 M, we’d have this mopped up during President Trumps first year of his second term.