No I don't think it'd help that much with a weapons program. The starter kit would be mostly focused on QA, compliance, configuration management, cost modeling, etc. and would not include any non-public information about like how to optimize a core for high-quality plutonium or U-233 production or how to do the chemistry needed to separate plutonium from other actinides and fission products. And of course it would say nothing at all about weapon design. That said, vast quantities of normal core design knowledge are widely available.