What makes you say that? It seems wildly speculative (at least, far more than the opposite opinion of believing he likely still has the coins he's believed to own).

Yup, it is wildly speculative. Seems just as likely a speculation as any other towards why he hasn't sold/spent the coins yet though.

Wildly?

When you develop software based on your own novel framework, wouldn't you need to do several test-runs, performance runs, sanity runs in the process? Do you keep all the intermediate debug data? I know I don't. In this case bitcoins would be part of the intermediate data.