This is outdated. It was true in 2013, but changed in 2014 (https://codereview.chromium.org/416403002/ ; specific change in elements.cc).
Two tangential cents/Unpopular Puffin: there's a lot of misinformation or half truths that are propagated about V8 in an effort to boil all their optimizations down to One True Set of Advice, in this post and others.
The thing is, in just about every case, the real answer is "it depends". That's why V8 is ~1,000,000 lines of code, not 1,000.
Please don't try to follow some rule blindly, much less derive. More often than not, when you try to hand-tune for the last bit of performance, you'll actually trigger something that was introduced to streamline the other [95% of] cases/JS devs' code, and then you've spent hours on making your code less readable with no benefit.
There is no "Try This One Crazy Trick To Make Your JavaScript Fast!!!" (or even ten!)
(And in this particular case of pre-allocation vs. growing as you go? Usually the difference is so tiny it doesn't matter, and in the other cases --- it depends.)
Disclaimer: I'm not on the V8 team but I'm on a personal basis with some of them, and these are my own thoughts cobbled from casual conversations.