As long as you have both In-Home Agent (IHA) and Verizon Update Center on your computer, between yes and no legit - yes that is legit.
If you are the original poster (OP) and your issue is solved, please remember to click the "Solution?" button so that others can more easily find it. If anyone has been helpful to you, please show your appreciation by clicking the "Kudos" button.
However if you have a current operating system, seriously consider ignoring the Verizon Optimizer. Your operating system will probably set better settings. Run a speedtest to see if your speed is good or not.