Yes. It is a master public/private key pair which it is displaying.
So if I want to back these up manually using the clipboard, then these are the only keys I need to back up for the HD account in question, correct?
It is currently saying '"Contains 3 private keys"
Is there any reason to locate and backup those 3 individually generated key-pairs? Are they forever hidden in the app?
If there's another Bitcoin fork then you might need those individual keys, it depends on how the wallets choose to incorporate it.
In almost all cases all you'll need is the seed.
If you really need individual keys then this will extract them -
https://github.com/iancoleman/bip39 but it doesn't discriminate between used keys and unused ones so you may be in for a lengthy search.