I said I was going to leave this question to actual deacons, but none seem to be piping up (or at least, none identifying as such)
I am pretty sure this is incorrect, at least in the US.
Canon law says:
Can. 276 §1. In leading their lives, clerics are bound in a special way to pursue holiness since, having been consecrated to God by a new title in the reception of orders, they are dispensers of the mysteries of God in the service of His people.
§2. In order to be able to pursue this perfection:
3/ priests and deacons aspiring to the presbyterate are obliged to carry out the liturgy of the hours daily according to the proper and approved liturgical books; permanent deacons, however, are to carry out the same to the extent defined by the conference of bishops;
And the USCCB says:
Canon 276, §2, 3º - Permanent Deacons And The Liturgy Of The Hours
Complementary Norm: Permanent deacons are required to include as part of their daily prayer those parts of the Liturgy of the Hours known as Morning and Evening Prayer. Permanent deacons are obliged to pray for the universal Church. Whenever possible, they should lead these prayers with the community to whom they have been assigned to minister.
Approved: General Meeting, June 2003
Reviewed: Holy See (Congregation for Catholic Education and Congregation for Clergy): Decree (Prot. N. 78/2000), October 30, 2004 ad quinquennium experimenti; Renewed by Decree (Prot. N. 78/2000), October 12, 2009 ad alterum quennium
Promulgated: National Directory for the Formation, Ministry and Life of Permanent Deacons in the United States, United States Conference of Catholic Bishops, 2009, art. 90.
I’m just sayin’.