It doesn’t work that way.
They define 30/week as a ‘full time position’, and are using that number for part-timers to increase the cost of hiring part-timers.
It still can be worked around by converting full timers to ‘exempt staff’, and working them a shift and a half.
Correct. Move them to "salaried" positions, then work the carp out of them. This is what will happen next. It's been going on for decades, ever since "exempt" and "non-exempt" entered the corporate personnel lexicon.