It is HIGHLY UNLIKELY that Topic 1 will come up in Paper 2.
However, you may see one question in paper 1 concerning absolute, fractional of percentage uncertainties.
An example of this can be found here:
I wouldn’t spend any time worrying about Topic 1 when preparing for Paper 1 (and Paper 2). It is very heavily examined in Paper 3 – so save your revision for that.
Hope this helps!