The phrase "an affirmation of that" is correct and usable in written English.
It can be used when you want to express support or confirmation of a previously mentioned idea or statement.
Example: "The committee's decision was an affirmation of that, reinforcing the importance of community involvement."
Alternatives: "a confirmation of that" or "a validation of that".
"The Bermondsey gallery is an affirmation of that.
This is Hume's skepticism: it is an affirmation of that tension, a denial not of belief but of certainty.
And all Americans should pause from the heated political rhetoric and reflect on the sense of accomplishment, win or lose, that his candidacy represents - an affirmation of that American ideal.
An affirmation of that magnitude, from such a powerful black institution, is worthy of mention.
At a church council held at Antioch (341), an affirmation of faith that omitted the homoousion clause was issued.
"Long Distance Love Affair," over a boom-bap beat and ricocheting organ chords, is an affirmation of loyalty that's still riddled with suspicion.
It was an affirmation of country that transcended partisan divisions: That we, as a people, are a whole greater than the sum of our parts.
"They take a landslide victory and make it an affirmation of everything that they campaigned on, their policy positions, and themselves personally, when in reality it's that the other candidate is worse or unacceptable.
In July 1917 he successfully negotiated with leaders of the Serbian government the Corfu Declaration, an affirmation of unity that laid the foundation for the future Yugoslav state.
Like performers in a historical drama, the so-called Rickshaw Boys of modern-day Durban, South Africa, use personal adornment as an affirmation of identity that transcends their humble status, as well as a lure to attract customers.
The Daily Mirror sees the celebrations as an "affirmation" of all that British people can be proud of.
