ah, he confirmed on twitter last night: https://twitter.com/MichaelAbberton/status/46560706028634521... so I think what happened is that the original image was produced, someone annotated it with unverified info, and Michael Abberton then double checked this and annotated it further with the bold text to note any claims which couldn't be confirmed.

I think that he's confirming that some claims aren't verified because he's being honest, irrespective of party ties.