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If Red Hat does not exist then what is this www.redhat.com ?

Anyway he is using RHEL (Red Hat enterprise Linux) in the survey results not Red Hat.

He didn't say Red Hat is fictional, he said he can't see Red Hat in the graph (and that was only because he was looking at the wrong graph).

I can see why you might have misunderstood him though. "Does not exist" could be read both ways.