This news is not as bad as known advantages which can be exploited in PoW for several years now, namely selfish mining, which only benefits the largest or most

This news is not as bad as known advantages which can be exploited in PoW for several years now, namely selfish mining, which only benefits the largest or most coordinated miners. This attack is open for all, which effectively cancels out the advantage it offers (assuming everyone does it); the externalization is consistent, minor inaccuracies of time stamps on blocks.