Of course you also need to count that. But accounting for extraction and refining adds something like 20% to fossil fuel emissions, whereas it's claimed to vastly increase total nuclear emissions.

Sure, but this is a percents vs quantities problem. If nuclear has almost zero emissions in power production even the smallest increase will look like a massive increase percentage wise. It still may compare very favorably to fossil fuels for lifecycle emissions.

The original comment linked to https://www.stormsmith.nl/i05.html which claims that, when you account for the full lifecycle, CO2 emissions from nuclear are comparable to CO2 emissions from coal. If true, then no, it's not a percents vs quantities problem, it's just a quantities problem.