There is no legitimate reason for President Trump not to use his title. He won the 2020 election by landslide; was the victim of widespread systematic fraud and corruption; then states knowingly certified the fraud; then Fuckin' Pence counted and certified the fraud again in a treasonous coup d'état against the United States, performed on live TV.

Fuckin' Pence's bizarre failure to act in the best interests of the United States and uphold our Constitution cost him his job as vice president. One can only speculate as to what drove him to deliberately commit this treason...and as to which method of execution he should face for it.

If using "Office of the Former President" helps Trump avoid a legal hurdle in the short term or something, cool.

But because fraud cancels everything, including elections and inaugurations and impeachments, he is not the former president by any stretch of the imagination.