There is no legal ground for compensation and right of return from 1948. It’s a UN declaration from the end of 1948, in December, after most of the Palestinians had already bern expelled or left. The settlements in the West Bank post-1967. Sure. Then you have an argument. You’d also have an argument for the Jews expelled all across the Arab and Islamic world post-1948. Compensation and right of return (none would take the latter obviously). 900,000 Jews left or were expelled around the Muslim world.
https://azure.org.il/include/print.php?id=581
But there are also arguments against the “right of return” and whether it even applies for mass population displacement. None of this is settled and has rarely been tried in international courts.
https://repository.law.umich.edu/cgi/viewcontent.cgi?article=1459&context=mjil
The last article comes to the conclusion that “right of return” does apply to mass population displacement even within the original UDHR and ICCPR frameworks and legal definitions. There have been arguments made against this from a legal standpoint, but mostly from Israeli sources, so while they can make the argument, the biased position they are starting from makes it hard to consider them a good source.
So post-1948 it probably does apply. But a diplomatic solution is probably the only real possibility here. Enforcing what that guy talks about is an impossibility on many levels imo
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