In the neuralink paper which I linked above, they say at the end of the "Discussion" section that the system is also designed for stimulation on every channel,

In the neuralink paper which I linked above, they say at the end of the "Discussion" section that the system is also designed for stimulation on every channel, but that they have indeed not yet demonstrated that capability. Basically the difference is that Neuralink is a general BMI with some interesting innovations that is still in the research phase, while the Gennaris system is a specific application that is about to enter human clinical trials.