Based on common software solutions for ham radio and similar technology:

He executed a macro he had written specifically for the Yaesu rig, a command that adjusted the radio’s DSP (Digital Signal Processing) to notch out the specific tone of the beacon. On the screen, the massive spike of the Ghost Net was sliced away, flattened into the background noise.

Normal radio controls were too slow for this kind of foxhunt. By the time a human hand twisted the dial and adjusted the notch filter, the signal would have moved. But allowed Elias to create a virtual "memory bank" on the fly. He programmed a scan loop to hop between three suspect frequencies in milliseconds, far faster than the hardware knob could ever move.

It looks like you’re asking about — a popular third‑party software suite for controlling Yaesu transceivers from a Windows PC.

While tools like flrig or Hamlib are excellent free alternatives, Win4Yaesu offers a "polished" experience that many find worth the investment.