Are you sure the pins themselves make use of magnetism? It looks to me more like he embedded a pair of square magnets on each edge for alignment, just outside

Are you sure the pins themselves make use of magnetism? It looks to me more like he embedded a pair of square magnets on each edge for alignment, just outside the outermost pins. Also: While there are magnetic pogo pin connectors all over AliExpress, nothing really fit the bill for this project.