Franz Bardon has some mystery in regards to his writings. In many ways, his writings are influenced by our side, and the publication of this knowledge came from the will of the Demons.
But Bardon was strongly with the enemy, and the situation is also that many of his writings might have been liable to perversion or things added on them after they were published. This created a lot of confusion in him. Even the moral undertones of his own work are quite confused.
Many of the enemy also have a decent understanding of magick, as they are sitting on mountains of stolen information. The enemy prohibits them however past a point, as even Bradon himself was prohibited. He mentions this on the end of one of his books, if I recall correctly. He was "stopped" from knowing past a point by the enemy in a very violent way.
Certain statements from his work do point me to the fact that Bardon had a mixed influx of knowledge, some of it from the Gods [that could have came from manuals the Gods originally owned, which were later absorbed by the enemy]. This adoption of the enemy system, which led him to many mistakes.
He was highly intelligent and could certainly see the contradictions, but there was no alternative really in his time. The only viable alternative for him would be Gnosticism, or something of this nature. Therefore, there was no escape.
The fate of many others of his time was similar, and the enemy was the only source of any "information", such as stolen Freemasonic knowledge, or knowledge the Jews would provide.