Technically true, BUT.

PocketID does offer a fallback to a numeric code for clients that don't support passkeys (e.g. most embedded webviews on mobile).

For those, you simply need to navigate to the PocketID interface (for less technically adept people you can put it on the home screen on their phones), and click the big center button "Create" in the "Login Code" section (see attached screenshot).

Unfortunately these login codes are long lived (10-15 minute I believe?) and aren't OTP compatible so you can't just register it in a code provider to use whenever needed.