The code is the old Roman-Empire ROTation code, which means that every letter moves for a certain position forwards. When you want to decode you simply go the same number of letter.
On the begining of the paragraph we see +5, which suggests that every letter was moved for 5 position. Just move each letter 5 positions backwards.
For example letter A is V, M is H etc..
“Evert operation reaches a risk-assessment stage. At this point, my determination is that Niantic is causing more trouble it is worth.”