Sponsor status is not a guarantee of authenticity. There are sponsors that used to sell repro snipers. Some repro sniper were assembled abroad and legitimately imported and sold here along with authentic snipers. This ranged from restored ex-snipers (imported from Russia) to regular rifles fitted with repro-mounts and repro-scopes (imported from Ukraine).
One has to check rifle features, serials and mount/scope pictures to make a conclusion about authenticity, source of the rifle is not really relevant as you're paying for rifle, not for the company name that brought. Also information on where rifle was sourced could be incorrect.
The one I see on EE with SFRC reference, Russian export markings and chipped lens is legit Soviet refurb.
OP. If in doubt PM me the link I'll help you.