GFF is notorious for shipping other breeds as "packing peanuts" when they ship out chicks. You have to read all the print on the shipping papers to see what else they might have put in there. This boy is very pretty, but I don't believe he is a SFH. I have never seen barring on a mature SFH rooster. Some of the feathers may appear barred up close, but the barring shouldn't be so uniform. I have also never seen a SFH roo that is primarily white with black and no red at all.
Also - I don't see any true "flowering" on him. All of my boys have flowering on their sickle feathers and it is most notable on their chest/body feathers. I see some possible lacing on this boy, but no flowering. Most of his darker feathers should have white tips - but not lacing - more like a chevron of white.
I'm very sorry to say it, but I really don't think this boy is a SFH.
I would suggest you get confirmation from GFF about what this boy is, and I wouldn't use him for breeding until you are 100%.