I think I'd distinguish ideology, something I think everyone has and most people are pretty idiosyncratic about, from theory in the sense of ideological positions formally set down on paper by a philosopher or thinker or journalist or whoever. Even technocrats and corrupt dictators aren't free of sets of ideological ideas that govern what they think is good, where the edges of their moral circle lie, and so on. "Screw you, Jack, I got mine" isn't really a piece of theory but it can be a pretty key ideological position for some sorts of people. If the number of people who agree with Rand's core ideological positions was limited to those who've bothered to read Atlas Shrugged, US politics would be a better place.
So I agree with you regarding theory, but I think there's interesting ideological analysis to do: for politicians especially, you can look at revealed preferences through their actions and the actions of people in their close political networks, rather than focusing on what people say. I do think it's a it too easy to push the boat out too far on the idea that expressed ideologies are all just post-hoc rationalisations though: it's easier for people to understand their opponents being venal or unthinking than understand them having a completely different social-moral framework, and I worry we end up going for the former understandings too quickly. Which isn't to say we should spend much time thinking about conservative theory, because I fail to see much evidence that conservatives read much of it. But it's useful from a political perspective to think about the tensions and divisions within conservatism, if one wants (as I do) a world with a much weaker set of conservative movements, and I think that requires some understanding of the constellation of preferences and ideals that they have.
As for the dictators - certainly Putin and his regime are extremely ideological, and I'd say that's true of Erdogan as well. A rational and simply corrupt Russian regime would never have invaded Ukraine and would never have made so many of the miscalculations on the way, a ton of which were based on an assumed ideology-narrative about Ukrainians being a rustic subject people who would meekly lay down their independence in the face of liberation by the mother country. Erdogan has by all accounts a similar imperialist/neo-Ottomanist view of Turkey's eastern neighbours.