I think that committee actually found that he hadn't done anything wrong (or at least that wrong) when it investigated him.
They found his dodgy holiday in Mustique was a breach of ministerial, but wasn't upheld (as PM is the final arbiter, natch). Now investigating whether doing up the flat with a 'loan' from a donor was a breach of rules.
The Committee found that Johnson hadn't breached the rules on his holiday. For the doing up the flat, that's been passed to some other committee (not quite sure why).
They found his dodgy holiday in Mustique was a breach of ministerial, but wasn't upheld (as PM is the final arbiter, natch). Now investigating whether doing up the flat with a 'loan' from a donor was a breach of rules.