Brazilian here, my great grandparent was part of the integralist movement as well.
First off were the integralist fascists? Well it depends on how you want to define fascism because the integralists were persecuted by vargas ( brazilian president at that time ) and vargas was a know "fascist" himself.
You can put the integralists as a fascist movement since they were against communism, against free market capitalism and had pretty nationalistic view, but them we would have to put a lot of other movements on the fascist banner ( in the end this is a really politicezed view on how to define them as a political movement)
But, one thing that people don't probably know here, there are a lot of different types of fascism and the integralist movement had a very big difference from the nazism fascism... They were not racist, in fact they were one of the first political parties in brazil to be openly against racism and had a lot of black and mixed race people on the party. This is huge cause racist ideas were pretty much mainstream in brazilian politics at that time and the integralists were one of the first movements to go against this.