Not the conspiracy theory
That page states,
Consider this: every round shot in breaking-in a barrel is one round off the life of said rifle barrel.
The premise of the page, is that during the break-in procedure, you can't do anything else. That is wrong.
More proof of my assertion.
Another tidbit to consider--take a 300 Win Mag that has a life expectancy of 1000 rounds. Use 10% of it up with your break-in procedure. For every 10 barrels the barrel-maker makes he has to make one more just to take care of the break-in.
It all got started when a barrel maker that I know started putting break-in instructions in the box with each barrel he shipped a few years ago. I asked him how he figured it would help and his reply was if they shoot 100 rounds breaking in this barrel that's total life is 3000 rounds and I make 1000 barrels a year just figure how many more barrels I will get to make. He had a point; it definately will shorten the barrel life.
I had broken-in my barrel as I was zeroing my scope and load developing. After 20 shots I had my scope adjusted and a few potential loads to test, and had a barrel that copper fouled considerably less!
So their premise is absurd in the extreme.
Another case in point.
My 30+ year old Win 94 had gotten a build-up of carbon near the throat. (I also was influenced by conspiracy theories at one time, and was under the false belief that a bronze brush would damage my bore.)
I had discovered the condition when my cleaning patches would keep coming out dirty.
After I cleaned it to my satisfaction, I took a pic of the throat to see how clean it was and found a ring of unworn metal where the carbon ring resided.
The ring isn't what is important, but the roughness of the barrel. That is perfectly clean, and it isn't mirror like whatsoever.
So I thought if I tried a break-in procedure, I might get that ring to dissipate somewhat.
I didn't shoot 100 shots in the air further using-up my barrel life.
I instead took shots as I normally would have at targets and distances I usually do. Probably took me months to do, since I take one shot a day with whatever rifle I choose to shoot at that time.
Here is what the barrel looks like now.
So I have a smoother bore without shortening barrel life; (per your link,) "every round shot in breaking-in a barrel is one round off the life of said rifle barrel."
And did I mention it shoots wonderfully?
The conspiracy theory doesn't hold-up to the least bit of scrutiny... and is rather ridiculous.
Links to barrel break-in procedures.
Question #223, What is the recommended procedure for breaking in a new barrel? -- Winchester Repeating Arms
Break-In & Cleaning
Welcome to Shilen Rifles, Inc.
Shilen, Inc. introduced a break-in procedure mostly because customers seemed to think that we should have one. By and large, we don't think breaking-in a new barrel is a big deal. All our stainless steel barrels have been hand lapped as part of their production, as well as any chrome moly barrel we install. Hand lapping a barrel polishes the interior of the barrel and eliminates sharp edges or burrs that could cause jacket deformity. This, in fact, is what you are doing when you break-in a new barrel through firing and cleaning.
I would go by what your specific barrel maker suggests.
I might add...
Barrel break-in is not to make your firearm shoot more accurate, it is to reduce copper fouling. In which, as it copper fouls less, you need not clean it as often to keep accuracy on par.