No it isn’t. The house is actually 2ft taller than the adjacent houses, but actually matched the height and lines of the houses at numbers 4, 11 and 22, in the centre of each terrace. Special dispensation was given in the 1860s, when building regulations had relaxed slightly, for the final house constructed to match the terrace, but allow the occupants to have a grander building. But this was twenty years before the Bishop moved in.
Where did the rumour it come from?
Urban myth that sounds like a good story.