This kind of things I think nobody can prove true or not. It's up to the individual.
If you don't believe, don't bother about it. If you believe, you should follow. Or if you are like me, which is basically no idea whether to believe or not, just follow what my contractor tells me. As long as you start renovations before the month (for 2016, it should be 3 to 31 August 2016), it should be fine. So, before 3rd August 2016, just take a hammer and whack away a few tiles, and you are good to go anytime after that.