In fact, you are talking about what he saw a single case. Try to do this not once but many times and from hundreds of attempts you will be able to repeat what you saw. This is a matter of chance.
not saying it's rigged but i have seen the same person go all in with hands like j3 off k 5 ect.. and win everytime against aa , kk. this is why for right now im sticking to freerolls
Also observed such things in these freerolls at an early stage, it is better not to answer these all-ins, when you already have some kind of Bank. And immediately why not take the challenge, because the tournaments were every hour.