Yet another report suggests Apple will have trouble meeting initial iPhone 9 demand

But the only thing Kuo is explicitly and firmly anticipating for now is a current iPhone production slowdown unlikely to pick up "until the second quarter of 2020." Of course, the beginning of Q2 is right around the corner, so that doesn't sound like such a big problem... as long as Apple manages to substantially ramp up manufacturing next month.
After all, this is a device tipped to combine a modern processor with an outdated design that however includes the beloved Touch ID fingerprint sensor. Add a reasonable price pointa bunch of factories either closed into the equation, and you'll immediately realize Apple can't possibly build as many units of this thing as it needs with a bunch of factories either closed or working at heavily reduced capacity right now due to public health concerns.