Not actually surprised. These people are evil, not stupid. He knows he drove away the low paid immigrant workers, they just want a way to blame them anyway.
Hallmark of fascism - the enemy is so strong that they'll steal your jobs, but also is weak and cowardly and deserves the poor treatment we give them.
As much as I hate DeSantis, I don't think calling for the murder of a U.S. politician (and governor) on social media is a smart move.
NSA agents, if you're reading this, I don't condone any of this!
But for the sake of the discussion: it was a weird comment for several reasons:
Come back with guns: why leave in the first place, then? They could have just legally purchased guns in Florida and use them for whatever OP implied, without leaving at all.
A situation involving migrants with guns would just make Florida republicans say "See? These people are dangerous and shouldn't be here. DeSantis was right!"
That's why I found the comment weird. But come to think of it, it's quite stupid too.
I think what they're trying to say is that immigrants should go there to do the job but instead immigrants are only going there with guns. Typical republican propaganda.