Can you point the article to the code where you found that?
I ran 12 CT’s through a 3/4" Liquid tight flexible conduit. I first used a string, then I used electrical tape and taped 1 CT to the string, then a second to the string and the first CT wire, leaving about 1/2" between the tip of the second CT and the end of the strain relief of the first CT. And I did the same for the rest. At the end I pulled them through (through a 90deg liquid tight and about 12" of pipe).
If I did it again, I would not use a 90 deg and rather try to route the conduit so I can give it a curve with that one… I also added a few drops of water (Careful! my panel was off) to make it a bit easier to pull…
I’m planning to pass 24 for a 1" next.