Is there a technique to reconnect the antenna cable?

While I was following the battery replacement instructions, I accidentally nudged this part, which then came loose:

I think it's the antenna cable, which was previously sitting atop the taptic engine connector (please let me know if this assumption is incorrect!)

By placing it where it should go, it looks like the other end goes in this gap:

I can see a small metallic connector under the plastic part, right in the center of this picture. Since this is a flexible cable, I can't push down on it like I can with other connectors with the plastic there.

Is there a way to either remove the plastic part in the top left of the picture, or to plug in the round end of this cable without needing to press down on it? The space seems just a little too narrow for the precision tweezers.