It's complicated. When the Valley's ESPN contract was first signed, ESPN+ wasn't at thing and it was all ESPN3. Today's game was also picked up by MC22 further complicating it.
You should be able to watch ESPN3 if you have certain internet service providers, Mediacom being one of them along with a few pay TV providers including DIRECTV, Hulu Live, and a few others.
After this season and next the TV contract is up and I expect everything to be on ESPN+ on the new deal.