The bold is not true since the length of the Anagen phase (that's the growing phase of the cycle) determines how long your hair can grow...and most people do not grow an inch a month. At the average growth rate of 1/2 an inch a month, someone's whose growth phase lasts only 2 years would have 12 inches of growth in that time before the hair started to shed. If they retained it all, that would mean they'd probably be at BSL, or very close for a tall person. So I think the realistic thing is to say, that unless there is ill health, at least BSL is possible for just about everyone...since 2 years is about the shortest an Anagen phase can last. Now if you are one of those lucky to have a 6-year-long Anagen phase or a faster growth rate, then you might be sitting on your hair in a few years.
I agree. Except I'd go further to say that, while the average growth rate is 1/2", not everyone's is. Some will be shorter so those people who have a slower growth rate and a shorter time period for growth will have the shortest hair. I'm also inclined to believe even the best regimen will lose some hair to breakage.
So my short answer to this question is "no".