That is not a metal panel down there...so no worries...
What it is, is the 'anti-noise capsule' (or front plastic undertray).
To me it looks like the rear 'edge' or section of the tray that has the
lower lip under spoiler attached to it, is now coming away. This has
obviously been hit; not just once, but many many many times over
quite a long period; and is now separating from the undertray.
It's no big deal TBH.
What that 'lip' does is help create a high pressure area under there
so that it helps suck hot air out that has been heated in it's 'journey'
through the engine bay via the radiator etc.
Suffice to say the Race Brab doesn't have that bit....ok...nuff said.
It's not an essential/vital part. So that should be a relief to you n Maz...