If you look at the poster's posts in this forum, all have been similarly loosely worded, with no substantive source, nor adding much value - obviously the speculation that follows is more informed. I don't think this is exactly trolling, but it isn't entirely in-line with this forum, likely better placed for a discussion on rumours (pprune anyone?).

As others said, if CX reduces their European network to just LHR it would essentially kill off their transit business for masses of their customers: Most Chinese airlines can boast of connections to at least LHR (along with other major centres like FRA, CDG/Paris, BCN/Barcelona) and for those passengers starting in South-East Asia, you may as well just use SQ (Singapore Airlines), or one of the European carriers who would offer better connectivity. The US markets do not seem likely to replace the European ones anytime soon. The closest equivalent would be MH (Malaysian airlines) that has a very small European business (I think just LHR before the pandemic) - they have been losing a lot of money (not just for this reason of course) and their brand is not well recognised in the European market AFAIK..