Yes and no. Fimming is definitely topping but its done a little differently to confuse the plant. It was actually discovered accidentally by a guy who was trying to top his plants. He missed the cut and only trimmed the top 2/3 of the growing "bulb" that is the very top of the plant(and the next group of leaves) as it grows out of the stem below. What he discovered is by only taking part of that "bulb", the plant continues to try to grow it out while at the same time trying to heal the damage, and dispursing the growth hormones to lower secondayr branches. This results in multiple "top main colas".
Why this is important is because the plant is engineered by nature to try to get its biggest and best flowers as high as possible for the best pollination and seed dispersal. If the top main cola(Bud, flower pod) is damaged or removed, the plant will respond by trying to move the next viable cola ahead of the damaged one so that a healthy cola can be pushed to the top. If the whole top cola is removed, the plant will move the next available which is the 2 lower secondary growths.
For some reason, when the top isn't completely removed, the plant gets confused and tries to push as many secondary growths up as it has. This results in as many as 6-10 "top main colas" that will be "trophy buds" because the plant will focus the most of its energy on those buds.
If you Fim your plants, then after about 10 days of growth you will see all of these new colas "exploding" upward, when that occurs, trim off any lower shoots that are emerging on or near the main stem. Then tie each one of the main colas and bend them over horizontally or diagonally to cause them to spread out some. This will open the plant up and allow more light to penetrate to all of the fan leaves, and the coming buds
PS: For you trying to keep your plants low when growing from seeds, this training process not only maximises the bud growth potential of each plant, it also takes up time and slows the vertical growth of the plant which will keep it short until it reaches sexual maturity and you can flip it to flower.