That post is highly selective in its information, ignoring the winter cuts at LGW (BCN removed completely which would account for the additional LHR frequencies) and capacity reduction on, for example, JFK which is seeing many more 777s than 747s (it used to be exclusively 747s).
It also doesn't take into account "dynamic revenue management" which is desperately trying to maintain load factor at the expense of yield (which has fallen off a cliff), meaning that status passengers spending £350 on a Y seat LHR-JFK-LHR end up in Club for one sector and Traveller Plus for the other.
Just like me last week.