No, but I can say that it went through as extensive a playtest as any edition had been at that time, and the designer of the game stated the team drew a lot of feedback that did impact how they moved forward with the product. I mean, it’s one thing that we DO know from someone in a place to speak with some authority.It is possible, but there is no way to know for sure. After all, I think it is pretty broadly accepted that 5E's success is NOT a function of its system, but of a convergence of many factors -- not least being media presence (Stranger Things) and streaming (Critical Role). I am sure it helped that 5E is both easy to learn and easy to stream, but I don't know that any of the elements considered in the playtest and abandoned would have resulted in a less playable or less streamable game.
In other words, you can't just say "5E was successful ergo 5E's final design is best."
Would the rise of Actual Plays, YouTube influencers and Stranger Things made 4e a success, for instance.