And immediately following that:

I told them that […] I faced two facts: > First, I had to pack up and leave California […] > Second, I had no backup plan […]

Neither of which is "I have sold the company". A few paragraphs later we see "But I’d kept all this secret."

So if he shared his diagnosis and the lack of backup plan, that is the "all this" that remained secret? The writing didn't seem clear to me on this point.