"• Conflicting orders are any orders that conflict with a previously given order. Revoking a freeday for another order is not conflicting."
Opening cell doors isn't an order so no, it's not a conflicting order. However,
"• CTs cannot obstruct a T's ability to follow the orders. Subject to admin discretion."
Opening a cell door and preventing Ts from being able to do their cell games as per the order seems like it's breaking this rule. So yes, to my interpretation it's against the rules to open cell doors if the order is to do cell games until X time.
Isn't the T blatantly rebelling depending on what teleporter they used? If orders are to freeze and they yeet over to surf in some other part of the map where CTs' attention are diverted from the group to that one T, it sounds like it's a blatant rebel. If it's a secret they're KOS no matter what, but from what you said it sounds like it's just a map teleporter and not a secret.
^ Above is just my opinion, don't take it as the final answer. I'll need to talk with the boys about this.