excessive secrecy is the sort of secrecy that in the end hurt you own long term position more than it hinders your opponent’s planning.I'm not sure what you define as "excessive secrecy", so I won't belabour the relative perceptions of that
My point is that we should find it doubtful that the model and the magazine cover depicts the true details of the real design, because it would be inconsistent with the past practice of the PLA.
Whether that is "excessively secret" by your standards, I don't know.
But either way, we should be doubtful that they depict the true final design.
As I've written multiple times, at best they are non official educated guesses.