The US president will waive 26 federal laws to facilitate the construction of 20 additional miles of the border wall, angering environmental, immigration, and Indigenous rights activists
There were funds appropriated for a portion of the wall in 2019 by Trump with the requirement that construction is completed by the end of 2023. Biden asked congress to reappropriate the funds, as he does not have the power to do so, and congress refused. His hands are mostly tied here from what I understand.
Not defending it, since I'm not familiar enough with the topic, but he waived protections provided the laws - not the laws themselves, which must be within his power if he's done it.