The distinction being made here is far more subtle than it is made out to be in the article.
There is a whole cottage industry of case law in almost every state (and under federal law) to determine which deadlines are jurisdictional and which are not. The case law is not uniform nationwide, and often, it isn't even consistent in seemingly analogous circumstances in a single state. The analysis is also more results driven than it is logical.
And, it isn't unheard of for a state supreme court to decide that a deadline that lower courts have called jurisdictional for decades, but that the state supreme court has never had an occasion to consider, isn't jurisdictional after all and can be tolled. I've seen it happen more than once (although I don't have citations to those cases easily at hand).
There may be practical importance to a parole officer deciding that the deadline has run. This might prevent the issue from ever being litigated.
But, the person quoted in the article on that point is a non-lawyer government civil servant who isn't the person who will make the final call if the issue were ever litigated, something that would instead be handled by a senior lawyer in the California Attorney General's office.
The author, like a lot of IT professionals and engineers, expects the law to be more consistent, logical, and predictable than it really is, and it so happens that this time he got lucky in his own case, so he thinks he's an expert.