The statement that is not true regarding Bach's "Brandenburg Concerto No. 5 in D major, BWV 1050" is:
"It features Concerto of three instruments."
This is misleading because "Brandenburg Concerto No. 5" actually features a solo group of three instruments: the violin, flute, and harpsichord, along with the string orchestra. However, it is more accurate to say that it features these three soloists rather than a "concerto of three instruments" in a conventional sense.
The other statements about the concerto being one of the earliest to feature the harpsichord as a solo instrument, including dynamic changes over time, and Bach presenting it as a gift in hopes of securing a job are true.