Think of the factory problem from physics first principals instead, as Elon would say. Musk says he will outcompete earth fabs by building them on the moon in just a few years, deploy radiation harden versions of the chips into space, and beat out TCO vs doing this on earth.
If he can do all that that fast, the RAM makers should be able to at least 1000X their fab capacity on earth in one year. One year for scaling up existing tech is an eternity compared to Elon's timeframe for moon-fabs given the relative complexity of the challenge.
The most well known thing about Musk besides being an asshat, is that his timelines are almost always imaginary. He is not building fabs on the Moon in "just a few years".
He doesn't have to build them to sell them. FSD has been sold for almost a decade, more than half the depreciation time of the cars. With first principles sales techniques it's possible X could sell these moon chips now and deliver them made on earth 6 or 7 Moore's law cycles later by a different company, like with the solar roof or hydraulic brick machine from alibaba, way cheaper.