I’ve never heard that…but that theory literally implies that bundling makes them feel more, not less, secure. There are many animals for which social behavior changes with season or age, and if that were true for pythons, it would suggests a pretty high level of social behavioral complexity, so… 
Most counterarguments that define a unitary social behavior actually imply social complexity from my perspective. You can’t really have animals with dominance behavior, unique personalities, etc etc without the ability to exhibit a range of social behaviors. Pythons have considerable brain complexity, including a modest cerebellum and several structures that don’t map well to mammals.
“After considerable study, we found that X animal was far less intelligent than we initially believed”…said no scientist ever. Practically every deep study on animal behavior has proven that it’s human nature to simplify and underestimate the intelligence and behavior range in other animals.