I think there is something wrong with the search function for the Columbo blu-ray release (and also the dvd entries):
If I search for "Columbo" I only get results for the blu-ray from seasons 1-7. However, it should also display the 80-2000 releases because at least the French blu-ray release is complete (and you get a result if you search for a specific episode, like "Murder with Too Many Notes". But if you do that however, you only get the blu-ray release, not the also existing dvd releases...). So something seems to be off with the search index.