I found this article BLS article on the definition of a labor shortage interesting:

https://www.bls.gov/opub/mlr/1999/03/art2full.pdf

The definition they settled on is "when the number of workers available (the supply) increases less rapidly than the number demanded at the salaries paid in the recent past".

According to this graph:

https://www.careerwatch.co/blog/electrician

Wages have gone up about 1.9% over the last 20 years which is just under inflation. That leads me to believe that there may not be a severe shortage. Are they just talking about this year? In which case I think every industry has claimed a shortage.