LVE is a teammate, and probably friend of, Smith. I'm sure he tweeted out of emotion, like a lot of us would. As far as some saying LVE is worried about being "next", you can't play in the NFL without having supreme confidence in yourself, I doubt the possibility of getting cut even entered his mind.
And he's playing much like his old self as far as what I've seen, similar to Lawrence he gets criticism because he doesn't get a bunch of sacks, passes defensed, etc., just goes about his business. Such offensive linemen sometimes don't get much credit because as is often said, they're not noticed unless they do something bad, like a penalty or missed block. If LVE fulfills his assignments which means if he just occupies an area so that the play isn't run there, or takes on a block so that somebody else can make the tackle or covers a running back closely enough so that the back doesn't get a pass thrown his way, etc. then the vast majority of the fans don't see that. But that was good linebacker play.
The tweet was a bit uncalled for, but he's human, have to factor that in...