OK, so they're actually 2 - 4 years behind. Got ya.
I'm going to use a made up car analogy here because many people here don't seem to understand what's going on.
Imagine Mexico starts manufacturing cars. They're not quite as good as Hondas, Fords, or BMWs, but they're rapidly improving and will likely be on par by 2030.
However, this Mexican company buys their leather from Canada, their tires from Italy, their transmissions from Germany, their engines from the US, the factory machinery from South Korea, and their in-dash electronics from Japan, and then assembles that into a car in their factory.
Now imagine all of these countries cut off this trade. Now, before they can advance and improve their cars, they have to build and design their own domestic engine factory, they need to design and build new transmissions, they need to assemble their own domestic tire production, their own domestic electronics, their own domestic factory machinery, and build relationships and shift to domestic tanneries.
Then they could start back where they left off and try competing.
Your "2 - 4 years behind" statement might've made sense in an alternate reality where there were no sanctions, but you forgot to include these sanctions in your formula.