Is this a complaint with the LBPD or a lawsuit complaint? I'm assuming the former.
I'll give my brief analysis of the video: Part 1 Part 2
First thing that jumps out is that you didn't consent to anything other than the 12031(e) check, but the officer didn't hear you, so when you repeated yourself and say you don't consent to any searches. It's good that you corrected this minor error. If you consent to 12031(e) then you can't challenge its constitutionality in court because both parties agree to the action.
Second thing that jumps out is you providing your ID. I say this fairly regularly when people get bullied by police officers, but if you're going to open carry, you should be willing to get arrested. He said you were detained, you should have asked for suspicion of what crime. If he said the carrying of an illegal weapon or something along those lines then stop talking and assert your right to remain silence. If they want to arrest you for not doing something you are not obligated to do, then that's great for you. True, you'll miss dinner and your friend might be upset, but you have video of them violating your rights so you will easily win a lawsuit against them.
Just to reiterate this point, we should all be extremely happy when we are capturing video and audio of a police officer willingly violating our rights. Just sit back and smile and remain silent. Let them arrest you.
If you're not willing to get arrested, then everything learned from your study of the law is pretty useless. You know what your rights are and what the law is, but you're letting somebody who is either uninformed or intentionally lying to you make your knowledge useless.
Third thing that jumps out is the amount of talking you are doing. I also say this a bunch, but don't say anything to police. We all know we shouldn't talk to cops but everybody does it. Just stare at them. Imagine everything they are saying equates to them asking to participate in a staring contest. Whistle a song or bite your fingernails or do anything other than talk to them.
Something that isn't in the video but that I think is the case is that police complaints are only around to prevent lawsuits. Think about how useful it would be if we had a personal complaint system. "I kidnapped your husband for 20 minutes, if you don't like it, please write a letter to my wife who handles complaints of this matter." You think anybody would bother with writing that letter to my wife? What's gonna happen? She's gonna say, "Hey, did you kidnap this guy? Oh, you did? That's not nice." Justice served? Now having said all this, I wouldn't file a lawsuit in this case because of the amount of talking you did.