Even though I don’t give any website access to my mic, and I’ve also prevented my browser any access to the Mic from Security & Privacy, but still every now and then I see the amber dot at the top right, and when I open the control center, it tells me that Chrome (or some website) recently accessed my Mic.

Control centre on mine doesn’t show anything about Mics (tho I don’t use Chrome for everyday browsing)…

It shows for just a second or two when your mic is accessed, and then it disappears.

First you see the dot on the control center’s icon. When you click the icon, you see a mic icon with some text in the control center, like the one in this image (copied from the link you provided above). I forgot the exact text. This icon and text disappears after that.

Screenshot 2022-05-25 at 10.21.41 PM579×709 27.8 KB