The Financial Times page gives the review this title: “The Standard of Living theatre review — Keynes’ radical optimism drives James Graham’s unwieldy new play.” Readers need a subscription to access the article, and the page offers no review text.
Without the full review, we can't assess its reporting. The available material contains no facts about immigration, border control, demographic change, EU policy, national sovereignty, or the play’s content beyond the title. Adding those themes would mean relying on information the source doesn’t provide.
So the source can’t support a substantive news article or an immigration-focused account. It gives no further details about James Graham’s play, its subject, production, cast, or the reviewer’s arguments. The page’s title is the only description of the play in the supplied material.