No I still don't see it. I guess inventing the word "liddle" is designed to sound like a cutesy childish way of saying "little", with also maybe the connection with "Liddell" although to me this sounds rather weak.

Even if I accept that hyphen really means apostrophe that doesn't fit either. An apostrophy marks the absence of a letter, usually a vowel, as for example did not = didn't with the apostrophe denoting the removal of "o". So no apostrophe needed.

There's got to be something more to "liddle" and maybe something which is not public knowledge but Trump does know and is using it to taunt Schiff.