You’re right, but remember that gates are bidirectional. Maybe in the future there’ll be a point where his brother reconsiders his political views but if he’s only surrounded by similar-minded folks, it’s way harder to break out of that social circle.
I learned that term on Lemmy and other social media platforms, never really questioned it.
I now quickly scrolled through that Wikipedia article and the most recent date reference given there is 1995 with the majority of events being in 196x or earlier. No recent event is linked there to the Zionist movement.