Which is otherwise known as “freezing out.”
Well, the sun is past solar maximum (Cycle 24 is one of the weakest solar maxima in a century; any ham knows that) and appears to be shutting down for a very deep solar minimum, so that means less heat makes it to the planets, resulting in colder surface temperatures, and yeah, at Pluto, some gases likely freezing out and becoming solids that drop to the surface.*
But to hear the warmerongers bleat, the sun doesn’t have anything to do with climate.
(By the way — the presenter is a lovely young lady, but she has the same problem nearly all of her contemporaries have — she talks too fast, and with tonal qualities that sound like scraping fingernails across a chalkboard. The information is good, the presentation is just annoying.)
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* Doesn’t anyone read science fiction anymore? Try Fritz Leiber, “A Pail of Air”.