The article claims that employment offices do not have enough job seekers to fill the roles. If true, this would suggest a shortage, and an Econ 101 notion of supply-and-demand that disregards time isn't evidence to the contrary.
> If employers want more workers then they can just pay more, or offer better working conditions.
This is irrelevant. For example, if low-wage or middle-wage workers have left the area, and the remaining workers have full employment, this would cause a shortage at the present time. Raising wages may attract new workers to move to the area over time, but until that happens, there will be a shortage.