Not 45%, no. Being a third and being 45% are very different in terms of power. A third means you have a voice but the other part still has twice the seats you have, 45% means you are basically equal to the other part.

Also, if it was just the 45% worker representation on boards and not the other things I'd consider him traditional left. It is a bit further than what you can find in Europe, but not overwhelmingly so, however all those combined is.

> The law allows workers to elect representatives (usually trade union representatives) for almost half of the supervisory board of directors. [..] It applies to public and private companies, so long as there are over 2,000 employees. For companies with 500–2,000 employees, one third of the supervisory board must be elected.

Ok, scratch that part. The other parts still stands. Also, Germany is relatively right wing in many other regards, cherry picking the most left wing part of every European country will still result in something far left of what you see anywhere in Europe.