Flow state can be a trap.
You can accomplish a lot of task checkboxes that are irrelevant. This is exactly what the article talks about. You must ask questions on whether what you're doing has any value - ultimately for you or someone/something you value.
And while in flow state you cannot ask such questions as they're not directly related to what you're doing.
Company values are at least a few degrees removed from this ultimate value.
If you spend all the time in the flow state, you're likely are achieving nothing for your own goals, because you're not setting any. (Or worse, the goals are not thought out.)
Flow is the same as hyperfocus physically, and overdoing will ultimately harm you physically, if not psychologically or socially first.
It's also related to meditation. Like meditation it is not always beneficial, especially in excess.
If this author has some other definition of flow, be careful, there might be a tautology or "no true Scotsman" involved.