No problemo. And yeah, that's how I read it, bearing in mind the usual caveats like: all costs (mining to site remediation) being accounted for, technological and price changes over the past 3 years etc. etc. I think 'cost avoided' is a good measure; LCOE is so sensitive to assumptions and accounting trickery that it's basically meaningless (see: Lazard).
Brookings seem to have made a fair effort (best I've seen thus far). It makes sense that combined-cycle gas turbines would pip nuclear power (in most scenarios examined) as they produce highly dispatchable electricity (i.e. their output levels can be changed very rapidly in response to fluctuations in demand for electricity). You can forecast and 'plan ahead' with nuclear, but the ramping times are currently too slow. So you either overbuild, rely on a limited amount of grid-level storage or throw a more responsive form of generation into the mix (i.e. gas turbines).
Most of the cost of nuclear is in building the plant, after which the variable cost of generation is tiny (i.e. you just run it full-bore all the time, since oversupplying doesn't carry a high cost). Coal probably has a similar cost profile (maybe with slightly higher relative variable costs), although on a smaller scale and in a relatively under-regulated market: the WHO estimates pollution from coal-fired generation, not taking into account climate-change, kills ~1m people per year, whereas nuclear containment buildings must be built to withstand a plane crashing directly into it.
But the really big take-away for me is that, if we want to mitigate climate change efficiently (which I'm starting to think is the same as saying 'if we want to mitigate it at all'), we really badly need to place a price on carbon emissions (and their equivalents). It sucks that both extreme sides of the debate don't seem to want this: vested interests will obviously oppose it, and 'extreme greens' seem to think it's some sort of immoral conspiracy designed to allow financial markets to make money off climate change (if we're talking 'cap and trade').
Those who don't like market-based mechanisms such as 'cap and trade' should consider the other side of the coin: it creates the opportunity for direct action on your part. You could buy emissions permits on the open market and then sit on them, permanently lowering the emissions cap. You can finally 'put your money where your mouth is'.
