Sounds like bad info to me!
Cycle may be term that's confused somebody? To me, the cycle is only getting the two groups of good bacteria available. One to convert ammonia to nitrite, the second to convert that nitrite to nitrate. Since neither of these are considered to be "free-swimming" in the water, I see very little that involves the water volume.
For really deep thinking it, we don't actually HAVE to have the cycle done at all, but there is a major price to pay for that as we will have to keep doing enough water changes to remove the ammonia which is a whole lot harder than removing the much less dangerous nitrate.
The only value of the cycle is to remove ammonia and nitrite which kill fish but we COULD remove ammonia in other ways if we were willing to do that much work! Creeks and rivers are probably close to that as they use adding fresh water to avoid becoming toxic.