Foxconn is a manufacturer, not a brand. They win contracts to manufacture products for other brands. You cannot buy a Foxconn-branded product, because they don't exist (yet).
I have a barebones PC that's branded Foxconn.
Over the years I have used several Foxconn motherboards. They were clearly branded "Foxconn" on the packaging and the boards themselves. Apparently you can still buy one today [1]. They also sell computer cases, fans and suchlike under their own brand.
[1] http://www.foxconnchannel.com/LatestProduct.aspx?T=Motherboa...
Foxconn could theoretically use the same strategy and as an example, be associated with high quality iPhone manufacturing that doesn't negatively impact their employees.
That would make them a brand, the fact that they haven't taken this strategy does not eliminate them from the discussion.