That buck is a broken steel.
Steel and red is tricky, because steel shows up on agouti (sometimes called the color 'steel' in some breeds), independently of agouti (gold tipped steel or silver tipped steel with the chin gene). And there is some reason to believe that steel can hide on self animals. Agouti cannot. Some people say all steels are agouti based, but that is not true so far as I can tell. I've produced the occassional steel offspring out of two selfs - but NEVER agoutis. I've also bred a lot of gold tipped steels and NEVER gotten an agouti based animal, and due to assortment AND that agouti is dominant to self - I should've gotten LOTS.

I think the confusion arose when some breeds have a color called steel that is genetically, steel + agouti - and then people think that is the ONLY way steel expresses, but that is not the case.
And to make it even weirder, it seems to work differently in Flemish than it does in other breeds.
Genetics is hard.
