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there are many behaviors that birds exhibit in the wild they do not in captivity, some is a change over time some is not, but having bred birds for over 30 years it is amazing at how things in the wild are not the same in captivity, lovebirds, cockatiels, etc are very adaptable.
What you linked was what I was told many years ago, upon advice of one breeder I cage bred my lovebirds for the first season to bond the pairs, then after the season put them in the flight, the next breeding season about half the pairs has switched, the season after that only about a quarter of the original pairs remained. I was in CA at a show and mentioned this to a few other breeders and they were like, yup happens all the time, cage breed if you want specific pairings. I had the same thing happen with my tiels.