He was talking about the entire nation, you're talking about Florida. You're also using the Presidential vote to try and insist there's gerrymandering of non-President legislative seats. And you're using what is perhaps the most ridiculous district in the nation (second only to that...pterodactyl shaped one the Democrats of Maryland made...) to defend this.
Seriously, pay attention to a claim if you want to rebut it:
What I said: "It's not because of gerrymandering, it's because of Democrat voters getting concentrated in fewer states. Combine this with the fact that people can vote for President in one party but - SHOCKER!! - can vote for other people in other races."
While you might might MIGHT have an argument (which would need a lot more to support it than what you've given) that a handful of states like Michigan or Florida have had any substantial gerrymandering, that does NOTHING to explain the results in Kansas or Oklahoma, where Republicans win handily. I've said it before, so I will say a version again:
NATIONAL popular vote does not decide STATE/LOCAL elections.
The poster who said this was right:
^ Agreed.
The Democrats have ceded a large portion of the country and its population with their focus on their ideology. This wouldn't be a problem for them if everything was decided by national popular vote, but it's not. And many states the statewide popular vote goes against them. No gerrymandering needs to happen for Wyoming or Kansas or Oklahoma to have Republican domination from the state to the federal level.
What's crazy is they seem to be unwilling or unable to realize this. The Democrat postmortem of 2016 is insanely full of denial. Far moreso than the 2012 Republican one, which was actually talking about how they need to back off their policies and try appealing to more people (then Trump won by appealing to less, but those that just happen to be in the right places geographically to make a difference - his margins in "red" states were smaller than Romney's, but in purple and light blue states, his margins were large enough to win). And the crazy thing is, the Democrats are insisting that they lost because they didn't go far ENOUGH left. That they need to double down.
Maybe the Democrats can use this to leverage a White House victory, but they're going to keep losing at the Senate and state levels unless they can convince their urban voters to move to...Kansas.
...like, literally. To Kansas. (Among other places, but the Wizard of Oz reference was too good to pass up.
...but this means, over time, they might have national power but, in an ironic way, less of an actual mandate and far more pushback from the states.