Setting aside the particular word that Bhikkhu Bodhi has used, the point seems to be about, semantically, what differentiates a Buddha from a (non-Buddha) Arahant?
This differentiation is namely that the Buddha rediscovers the ancient path and (as opposed to a 'Silent Buddha') establishes a dispensation (sasana).
Therefore the geographical expanse in question seems less important than the idea that (wherever it is) there is not already an existing Buddhasasana there.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead" - Thomas Paine