It is not a recent development that the Biden Regime is paroling in illegal aliens who were previously deported as is happening now with failed Cameroonian asylum claimants.
The policy of hands-off illegal aliens who were previously deported goes back to the Obama Regime who allowed illegal aliens to get an unofficial amnesty.
One of the first acts of the Biden Regime was to begin a policy of paroling in those illegal aliens previously deported.
The latest iteration of that amnesty is that those with failed asylum claims are being paroled in, though it is not clear to do what. The Cameroonians are claiming they were abused in custody and that their claims for asylum were not addressed. (H/T W.R. Flynn)
There is no legal process to reopen a deportation. A few rogue Federal judges have previously ordered deportees returned, but those were rare and had no legal basis.