未来進行形は、未来の時点で進行中の動作や出来事を表現するときに用いられますが、例文は進行中の動作とは考えられません。

、、。

The future progressive is used to express actions or events in progress at a future point in time, but the example sentence cannot be considered an action in progress.

Literal

Future-progressive [topic-は], future [possessive-の] point-in-time [at-で] in-progress [possessive-の] action [and-や] event [object-を] express [when-とき][at-に] is-used[but-が], example-sentence [topic-は] in-progress [possessive-の] action [quotative-と][topic-は] cannot-be-considered.

A metalinguistic sentence explaining the future progressive tense — from a grammar reference discussing English tenses in Japanese. 用いられます is the passive of 用いる, a formal synonym of 使う. The key pattern ~とは考えられません uses は after と to emphasize the scope of the negation: 'cannot be considered to be X.' The whole sentence is textbook register — precise, impersonal, written for students.