In plain English
The US 10-year real yield is what you earn on inflation-protected Treasuries after inflation expectations. When that number is high, sitting in Treasuries pays; gold and bitcoin feel more expensive to hold.
This Bitcoin-desk version is inverted so “easier” is up. When the oscillator is high, real yields are low (tailwind). When it is low, real yields are high (headwind). The Market-desk Real Yield card is the same series without the flip.