Essentially, yes that is correct. I based it on the cross section of Deuterium at NTP.
A chemical cataylst is a bit different because it doesn't require overcoming the coloumb barrier. If a nuclear catalyst existed, it would have to lower to almost no energy or even bypass the coloumb barrier for a D-D fusion reaction to occur at NTP. Do you know of any situations were the coloumb barrier has been altered?