Is Ningbo Siming Neijia Boxing authentic?

Siming Neijia Boxing should be authentic. Xia Baofeng of Ningbo is the head, and the inheritors of each generation are clear. However, I have seen Xia Baofeng's boxing drills, which are really unsatisfactory. You can find it online, and the practice is very poor.

As for Songxi Neijia Boxing in Sichuan, it's hard to say. Sichuan Songxi Neijia Boxing is good, but its inheritance is far-fetched and unconvincing.