No it is not. It is an unauthorized revision of the Benedictine Hours. For example, it has separated itself from the liturgical calendar, which is part and parcel of the Liturgy of the Hours. Instead the author chose to use the normal secular calendar. So no Easter time devotions, not Feasts or Solemnities, no Advent preparation, etc.
In the USA, there are three acceptable publications. The 4 volume, Liturgy of the Hours, single volume Christian Prayer and the pocket sized Shorter Christian Prayer (aka Traveling Breviary).
These three are published by Catholic Book Publishing.
In the UK, I believe they have a three volume edition Divine Office.