The only confirmed connection between Red Bull Global Soccer and Rangers FC is a January friendly between RB Leipzig and the (fallen-but-back-on-its-feet-again) Glasgow club.
But that news (confirmed in early November) and the news that Red Bull was in the market for an English club...what's that? Indeed, Rangers is definitely not an English club. But Scotland is not far from England, and the distinction between English and British might be a little too much for the rumor mill to process.
Somehow, it would seem those pieces of information have combined to fuel the rumor that Red Bull might be ready to invest in Rangers.