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Darrington Press isn't the same as CR. Tal'Dorei Reborn is 5e compatible but not printed under the D&D brand. I'd be shocked if they were foolish enough to lock it in with some exclusive license*.
*Especially because they didn't even get to use the D&D brand on it!
Actually, page 280 of Tal'Dorei Reborn is the Open Game License v1.0a. This book may have needed to be done that way because much of the book is the same as the Tal'Dorei Campaign Setting book that was released by Green Ronin back in 2017, and pg 143 of that book is the 1.0a Open Game License. If something was once released under 1.0a, I don't think you can legally do a "2nd edition" that is closed or not part of the Open Game Licensed.