Do they not count Bruno because it was the WWWF?
Yes they do but I can't see a reign in this era going 2,800 days. That's 7.6 years. We are just 3.3 years into Roman's. That's 4.3 more years.
For Roman to become number 2, which is surpassing Backlund's 2,135 days, he would have to be champion until July 6th, 2026.
Roman will surpass Bruno's 2nd reign of 1,237 days in about 70 days from now. By the time the Royal Rumble hits, he will have passed this.
So if he drops it at WM he will have 4th longest reign of all time behind Hogan, Backlund and Bruno's 1st.