If you look at their implementation the balance of probabilities definitely leans heavily towards “backdoor” rather than “not a backdoor”. You aren’t going to

If you look at their implementation the balance of probabilities definitely leans heavily towards “backdoor” rather than “not a backdoor”. You aren’t going to find any cryptographers anywhere who’d be willing to repeat your “They didn’t backdoor it” lie. If it looks like a backdoor, swims like a backdoor, quacks like a backdoor, then it probably is a backdoor.