One cop isn't all cops. But it's definitely SOME cops. And if you habitually defend every cop like you do, you'll miss that.
The guy is also right about one thing- it is hard to tell your boss "F off" but that doesn't mean there aren't also points at which honor dictates that you do so or you are morally obligated to do so. I think a lot of people, particularly "2A supporting" cops overestimate their willingness to do so - or fail to understand what their unwillingness to do so means.
There are lots of cops that are confident that if there was ever gun confiscation, they would be the first to rise up against a tyrannical government. I'm sure even many of the cops that have enforced red flag orders think of themselves that way. There are plenty of cops that would think that they'd never confiscate guns up until they were ordered to do so, and then they'd find an excuse for why this wasn't really confiscation. You can see that guy doing it already with the scare quotes on freedoms and confiscation.
There are also plenty of good cops and miltiary personnel who would not do so- the Oathkeepers draws heavily from former cops and military - that's where the name comes from, keeping the Oath they gave. But the ones who would not do so are the ones who are, typically, the least knee-jerk defensive of these institutions when it comes to these issues.
That's why I think it's important for people in a potentially morally compromising line of work to have thought out specific things that are fairly likely to happen that will cause them to say "F off" or quit.