??? Why don’t you tap it and see.

I did try that. Nothing appeared to happen, or change on my end; however, I now realize what the issue was. The first thought that I had, when I first noticed that Icon, was actually the exact same as that which you said; it just never occured to me that I could be on the same instance as the comments in question. So, when I tried clicking that icon, I was clicking it on a post that was from Lemmy.world -- the same instance that I am on. As such, I noticed no change in the displayed content -- the page would appear to load, but nothing would actually change. This is, of course, to be expected -- I just didn't put 2 and 2 together. I apologize if my inquiry seemed lazy, or thoughtless.

As an aside, In my defence, the UI also doesn't necessarily tell you what the icon does. If you hover your mouse over it, you will see the following:

Imo "link" isn't exactly descriptive, as to the button's purpose.