No Jim.
Your source lacks the prestige of History Ireland and is not written by any historian, but read your quote.
They were agreeing to a Boundary Commission to consider the boundaries, not to any actual boundaries.
The agreement was subsequently refuted anyway, threat or no threat.

In the course of the negotiations Griffith, and then the other delegates, were persuaded to accept the
proposal for a Boundary Commission to address the unity issue. Under threat of war – and with the last
minute concession of fiscal autonomy – the delegates signed the Articles of Agreement on 6 December,
which proposed the establishment of an Irish Free State as a self-governing dominion within the British
Commonwealth.
Subsequently, the Cabinet (on 10 December) and, then, the Dáil itself (on 7 January, 1922) split on the
issue (the Oath of Allegiance being particularly contentious) and by June, 1922, armed conflict had
resumed as the armed forces of the two sides fought in the Civil War.