At a glance it certainly appears discriminating and racist. However the establishment may have many excuses as to why they did what they did. Unavailability of visas hence actually not wanting to waste the time of applicants, having already an Egyptian cook(or cooks) hence not wanting another(due to wanting to keep their cuisine varied), them actually lacking the knowledge to know that such ads look bad, etc. Unless we hear their side, it's really hard to assume they intended on being discriminatory.