Couple of notes.

The anarchist of that time held different beliefs than a modern anarchist or agorist usually would. Any critique of those positions was of the older positions not current thinking.

The praise for labor unions also comes from a very different type of labor union than we have today. At that time your union rep had to come to you on the factory floor and ask you face to face for your dues. If you felt the union hadn't earned them you could tell him no. If you declined to pay your union member status and job were not terminated like they would be today. Union membership was not mandatory to work there. Your dues were not taken out of your check by the company automatically.

This means that the unions that these thinkers described were much more rooted in voluntary free association than a modern union. Based on unions at that time and not current ones, union based organization of society is very much in line with the thinking of current agorists.