The photos in both the above links show what seems to be the left side window. The accompanying words claim the co-pilot pushed his weight against the remaining, unharmed, 3rd layer of glass. Was he sitting on the pilot's knee? The same photo shows an ID plate on the instrument panel with what appears to be the reg: N560UA. My info (Planebase) shows this belongs to a United 757, which went into storage at San Bernadino October 2016 and was last seen there 12th November 2018, a couple of weeks after this incident.
The law suit says the flight was UAL931 on 17th October 2018. Records show this flight was carried out by N653UA, departing Chicago at approx 00:55 GMT. Looking at the track of this flight on Planefinder, it showed it passed over Gander, going nowhere near Goose Bay and it landed at Heathrow at 07:04 GMT.
So what aircraft was this bloke really on?