It's that gatekeeper thing interfering. Newer versions of Mac are more and more open source unfriendly than they were. There's a workaround over at Irony GitHub but I can't link it directly here (last I checked I cannot link towards GitHub here).
Head over to Stellaris Modding Den discord and find Irony channel under partner projects and ping me there I'll link the exact post on github here.
Head over to Stellaris Modding Den discord and find Irony channel under partner projects and ping me there I'll link the exact post on github here.