What your post says to me is that your group likes poker in theory, certain aspects of it anyway, but not the part about it being a gambling game where people may have different approaches to risk. You mostly want 3–5 hours of predictable social activity where no one has to make any meaningful adjustments or do anything, really, except play Fundamentally Sound™ poker strategy. Because it's a "thinking man's game."
Thing is, you're flat lying to yourselves about it being a "thinking man's game."
A thinking man would think about this player and how to defeat his clearly flawed strategy at the table. A thinking man would welcome the challenge.
Instead what's happening is that you're all reacting emotionally to how his presence disrupts your Fundamentally Sound™ poker game. It causes people to have additional risk of busting early that should exist anyway, but doesn't exist because making the game last is more important to your players than winning. He forces players to have to make unorthodox decisions, like whether to call all-in with a naked ace-high or a small pair against a player you know is shoving very light—but they fold 90% of these tougher calls because they don't want to take a chance of busting. It introduces a lot of variability to your meticulously calculated stats too. The humanity!
I used to play in a game a lot like this, where it was the same 16-ish people sitting at the same 2 tables week in and week out for years, and they would positively bristle at anyone showing up and playing in an aggressive manner. I was once warned about this by one of the players, who suggested that my semi-bluff shove on the flop was a bad play because "People here tend to play very tight" (exactly why it was a great play; it only didn't work because she flopped a set).
This brings me all to a simple point: your tournament is more of a social ritual than a poker game. That's why your players get upset when someone rocks the boat even a little—even in a way that's easily defeated and doesn't affect more than the first hour or two. He's an outsider bringing his outside ways.
Now comes the tough part. You have essentially two choices, but there are consequences either way:
1. You can uninvite the player, but if you do so, understand that you should also accept what I've said about your game. It exists in a sort of stasis, and what's bothering your players isn't so much that what he's doing is less than poker (it's not), but that what you are doing is less than poker, and his introduction of perfectly valid poker play ruins it for you. Introducing him to the game disrupts the stasis, and the stasis is more important to your players (and you, perhaps) than the poker-ness of the game, so here we are. This seems like the clear choice in your group's case, but it also means that it will be difficult to keep your game alive over time, as any new player you invite may disrupt the stasis in some way.
2. You can allow your game to transition out of the stasis, into a more flexible game that accepts varying strategies and personalities, e.g., you wouldn't ban this guy or anyone solely for the quality or aggression of his play. The upside is that your game will be able to add and maintain new players more readily, but of course you may lose some of your more curmudgeonly existing players, and it will be more of a poker game and less of a social ritual overall.