First, the Seventeen Dragon Capturing Palms should be with the Beggars' Sect, and Chen Jie's only contact with the Beggars' Sect was competing against Feng San in the arena.
After that, Chen Jie even went to South City, where the Beggars' Sect is located, so where did he get the Seventeen Dragon Capturing Palms from?
No way to obtain it, right?
Moreover, Darugachi Mansion, the Fishing Guild, and Guild Cao, who mobilized over a thousand people, were unable to find the technique. If Chen Jie found it, wouldn't that make them seem incompetent? The probability is so small it can be ignored.
And according to their investigation, it is very likely that the Secret Palm Technique doesn't even exist, because if it does, why doesn't anyone in the Beggars' Sect know about it?
This is illogical; it is said that there are no walls that can't be breached, but as for everything about this secret, is there really not even a breeze getting through?