Yes the majority of positions are never listed publicly, so numbers from Monster is only the tip of the iceberg. But that goes for all positions regardless of language. If you have 5 times the listed positions for one tech over the other, it would be logical to assume the amount of unlisted positions have roughly the same ratio.
It's impossible to verify this statement since the positions are never published. I have a strong feeling the most boring companies have to resort more to professional recruiters while the most fun to work for can rely on networking.