Therefore it's ridiculous to say OP deserves a % of revenue/profit/equity of their co-founders next venture. There's no legal or ethical basis for negotiating this.
But from the OP it sounds like the cofounder might be continuing in the same line of business, but wants to "pivot" and jettison the now-dead weight of the technologist.
If this is the case it seems plausible that his contributions and R&D are still relevant, even if they're throwing out his code, and so perhaps he's entitled to whatever stake he vested over those first two years.
If the co-founder is taking just knowledge, best-practices, know-how, and life experience, then the other co-founder does not have any legal basis to expect anything.