I don't think the title is that misleading.

We talk about the sonic boom as something that happens when we travel faster than the speed of sound. We don’t specify “in the same medium you’re traveling in”, and noone reasonable thinks “it’s really hard to travel faster than the sound in carbon”.

You’ve added “speed of light” in your reading and concluded that’s what the OP wanted to imply.

I think that was unfair, and distracted from the rest of your comment.

I, for one, didn’t know what the cherenkov radiation is, and when reading the title thought “oh, so it’s a sonic boom for light? That’s so cool!”