Augustus
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No. You dont even know who he is. How can you call him a scholar and philologist if you dont even know who he is?
Because he has published scholarship on an issue of course
There are many people who have written under a pseudonym throughout history, and their work is judged on its merits. CL's work is not widely accepted, but seeing as I've never argued for its accuracy this is irrelevant to my point.
Anyway, none of the other scholars I mentioned uses a pseudonym, and most if not all have held positions at recognised universities. So unless you plan on making your 'no true Scotsman' arguments against anyone who says something you don't agree with then CL doesn't even matter.