Did Apple send the short message to the other party?

Apple SMS has been sent, and it is impossible to prove whether the other party has been hacked.

Blocking will not affect the delivery status of messages. For Apple phones, you can confirm whether the message has been sent by sending the confirmation option or iMessage. If this option is turned on, the delivery confirmation will appear after the other party receives the SMS. But it is worth noting that this sending confirmation only tells you that the message has been sent to the other party's mobile phone, rather than being seen or replied by the other party.