That's exactly it, Alegrias.
Cummings doesn't need to make a living, or at least not in the sense that most of us do, or did. His family has plenty of money, and I'd bet that he could live for quite a while on what's in his own bank account. In any case, he is still highly employable as someone who is extremely good at dealing with the media and with spinning awkward news stories.
I think he's telling the truth. If he'd still been in post as a SPAD, we'd be getting a very different version of events, if we knew about them at all.
None of this makes him or Johnson anything other than reprehensible, but as I say, I believe that the parties happened in absolute contravention of the rules that the rest of us had to live by.