Today's Hindenburg report on Roblox didn't do much because the allegations contained in the report are old hat and already known. Several media stories state that these allegations have been made by a number of other short sellers previously, and there is little to nothing new in the Hindenburg report.
So why is Hindenburg publishing this story now? I don't know, but I wonder if they have some insight on timing that others don't that can potentially move the market downward. Their connections are very good, and their stories tend to be quite timely. I wouldn't bet against them knowing something important that is likely to move the market that others don't yet know.
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