As far as I'm concerned, if there's at least one degisgated starting point and one designated finishing point, you have a hole. The distance between those points is irrelevant.
If you have at least two such things and some sort of alphanumeric designation of the order they should be played in, you have a course. You could set up baskets in your living room and bedroom, tape lines on the floor of where to tee from, degisnate one as '1' and the other as '2' and call that a course.
Now should that course be listed on here? Used to set a world record for most holes played in 24 hours? Taken with any grain of seriousness? Probably not on all three, but as far as some of us are concerned with respect to the record, that threshold has already been crossed, and with holes being a non-standardized unit of measurement (unlike say feet or meters), and no minimum distance standard established prior to so many attempts, that was inevitable.