As time goes by, the web is turning out to be as big a source of misinformation as actual word of mouth - no, its not true as far as I'm aware. In fact, I have, in the past, clipped off the tips on mine if they've developed what looks like a spike on the tip of the leaves. Although the 'spike' or point looks like a thorn, it isn't, its quite soft, but might cause injury to the eye of a small child if they fell onto it - which is why I used to clip them off. I suppose, when I clipped them, the leaves were already the average full height of 2/3 feet though, so maybe they would have grown taller if I hadn't removed the tips, hard to say. I should like to see this Youtube video, so a link to it would be helpful.
As far as I can tell over 17 years of owning one (during which years its largely been completely ignored) it seems snake plants are practically bomb proof as long as you don't overwater - new growth arises at the base of existing leaves, and those leaves will grow on normally, even if other leaves are damaged.