This would work well with a monochrome sensor, if it’s used in front of a sensor that already has a color filter array then there will likely be all sorts of interference (if the filters don’t match exactly) with no gain in resolution.
Similar to the example in the Wizard of Oz you’d wind up with 3+ color records in the computer, but unlike the Wizard of Oz, they’d all be from the same piece of film, somewhat reducing their value for dust/scratch detection. You’d get a similar result from using different, discrete wavelengths of light to illuminate the film, although there is some benefit to using a full spectrum source in place of or in addition to individual color lights.
It’s hard to say what tool they’re using in the clip, but they mention the Perlmutters at WB who developed some of the custom software they used. Sadly they’re not specific and I’m betting it’s probably an internal, proprietary thing.