The electronic restriction data prohibits departing in the evening betwen 1630 and 1901 inclusive, only from Farringdon, St Pancras, Blackfriars, City Thameslink, London Bridge, Elephant and Castle, Old Street, Moorgate, Kings Cross, and Liverpool Street. As your journey departs from Finsbury Park, you're not subject to that restriction.
The published restriction data does prohibit the journey as they refer to the train instead of the journey, but you are entitled to rely on an itinerary issued at the time of ticket sale.