Exactly. Only PERMANENT service address changes that come with a 2 year contract renewal and a tech visit. A tech has to show up and sign off on the new install address on site.
Existing accounts were migrated to the new system and given a new account number:
https://www.att.com/esupport/article.html#!/directv/KM1174889?gsi=7pjd27
They started migrations over the last year, mine was migrated in April. They keep rolling through them month after month, and all new subs are only being provisioned in the new system.
If you could log into your account via directv.com, you were never migrated.
You can check out the RV forums, you'll find lots of reports like this one:
DirecTV 'Service Address' problems
Once you're in the ATT billing system, "moving" is done.