That is not true. Traditional orders such as the FSSP, ICK, Society of St. John, etc. still use the traditional Office. Even diocesan clergy can pray it. All they need is permission of the bishop.
As for a schismatic mentality…that is nonsense. Just because a person has an attachment to the former traditions and devotions of the Church does not cause one to develop a schismatic mentality. In a way, the Holy Father encourages us to seek those traditions. He called for bishops to have a wide and generous use of the TLM (which they aren’t), he asks people to start saying the St. Michael prayer, he has encouraged people to pray the rosary every day when that devotion had fallen by the wayside in the few decades following the Council.
I still stand by my recommendation of
Breviary.net. While it does not have an imprimatur, it is a good resource for comparing the two versions of the Office. I could have sent the person who asked to Traditio, but the guy that runs that site is a nut.
If a person wants a Latin-English traditional Office, with Imprimatur and nihil obstat, look on ebay for the Collegville three volume edition.