Paul Farquhar
Legend
It seems to that the intent is that the aliens are LLMs, who having assimilated all the data on their own world move on to search for data to assimilate on new worlds. “Food” is used metaphorically to mean something they hunger for.While that might make some sense on a realistic level, ignoring the fact that such radiation is freely available in the universe without needing to attack another sentient species, I think it's something else. I expect they think they're even more clever than that and want to make some social commentary about data mining.
It could work as a Doctor Who plot.