It's been obscured though, IIRC, isn't there small text on a same colour (darker shade) background outside the edge of a box. I've only done a handful of Win 10 installs, I just remember being confused "how do you do it without an account again", it has not been clear.
I noticed this change months ago. Probably with the release of 1903 (with a 1903 ISO). It seems to be dependent on whether you have an active connection or not. If not, it shows the offline option. If you do, it makes it really hard to find.
Did you download/create install media at that time? Fwiw I've done a handful of (re) installs of W10 pro at work (over the past year or so) , and the installer experience along with enrollment in azure ad has been different every time...