Hi, when fitting much shorter people, specifically Asians, they need putters that are 28"-32" long. This means cutting them down far more than the 34" mentioned in your article as being 'acceptable'.
This whole swingweight issue seems a bit muddled. What i want to know is that if a person needs a shorter putter, it is generally because they are smaller, and thus a standard 340-360g putter head may already be too heavy for them. So if you cut a 34/35" putter down, it may feel lighter, but in reality the weight remains the same and the putter may then feel lighter and even more suitable to them and they should see increased accuracy as they are not swinging something that is not suitable for them in the first place.
If you go adding weight to the head for every 1" you cut off, then by cutting a putter to 28" must mean you have to attach a big gob of weight to the head to 'balance' it. This seems a bit off the mark...
98% of my putter fitting with Asians is 28-32". I am 6' 2" and I use a 32 1/2" putter (I have long arms and a nice bent over posture).