I don't particularly have an issue with the comparison other than that it's lazy. It's also a pretty difficult and problematic stance to take when it comes to immigration, given that Israel itself has one of the strictest, worst and most exclusive/irrational immigration policies in the world ... if not in fact THE most. So it's a discussion best avoided for fear of falling into a dodgy trap on comparison of policies... to be blunt, if you take the Godwin stance on the current UK immigration policy, you rationally HAVE TO say the same thing about the Israeli policy, and then you're in 20 feet of hot water with no ladder.
I won't deny for a second though that the UK's immigration policy is short-sighted and fundamentally racist. Has there ever been anything quite so glaring as the UK government appealing for UK households to take in and sponsor Ukrainian families whilst sighing "oh well" when Syrian children wash up face down on our beaches?
And then all of those "well meaning" White British families finding out that Ukrainians are actually quite culturally different to British people and saying "'old on a minute guvna, these folks just LOOK like us, they ain't like us at all!!" and putting them out

.