I can take this one, as they say.
The distinction between US and UK investors is a simple one - the tax treatment on gains and dividends, as well as an FX angle (i.e. USD vs GBP). Meanwhile UK investors have understandably been derisking the UK, given their existing exposure via property, sterling etc., and the inherent risks stemming from this Labour government.
I work with a lot of financial journos, and just as you dont trust, say, the DT, the financial press often gets things wrong too.