You can be absolutely certain that USA Hockey will not support it being up to DVHL to follow state guidelines. They say specifically
Local rinks and programs need to follow the guidelines set forth by the Center for Disease Control and Prevention (CDC), as well state and local government officials in determining when, and how, it is appropriate to return to the rinks, including requirements or guidelines for physical distancing, size of gatherings or number of people permitted in a facility, or wearing of masks, etc.
If you have players coming in from Delaware to practices and games and someone gets sick, guaranteed all the rink and club waivers protecting coaches and officials and the rink from from negligent behavior claims can be thrown in the trash.
USA Hockey and professional insurance will most likely not protect players or coaches who defy the state guidelines.
Also, any travel to impacted states means a quarantine when you come home.
It would absolutely be a Safe Sport reportable offense if any coach, parent or official did not quarantine after visiting Alabama, Arizona, Arkansas, California, Georgia, Florida, Idaho, Iowa, Louisiana, Mississippi, Nevada, North Carolina, Oklahoma, South Carolina, Tennessee, Texas and Utah (Philly's travel advisory) and USA Hockey should pursue offenders with vigilance.
This isn't difficult: one death, one ventilator will mean rinks shutting down, some for good. Can you imagine being found out as the kid or parent or coach who didn't follow the rules and killed some official or rink staff or worse of all a child?