Does my dog have separation anxiety?

I have a 6-month-old Labrador that I adopted at 5 months from a family who had to move abroad. After about 3 weeks with us, we left him alone for the first time when we went to church, and when we came back he had destroyed several things in the living room, including a charging cable that had been out of sight and nearly caught fire.

This behavior continued a few more times and I got afraid he would destroy my sofa, so I suspected separation anxiety and started researching. I read that limiting his space could help, so we restricted him to the hallway, kitchen, and garden. However, he still destroyed items like a camera we set up to watch him, the rug, and trash. When we checked the camera, he seemed very restless, couldn’t settle, and eventually started barking excessively.

After discussing it with my husband, we decided to let him stay in the living room again since that’s where he usually sleeps. It’s now been two days, and he seems noticeably calmer—he watches outside and has even laid down quietly for a few minutes. I left him alone for nearly 1H and a half yesterday, Now I’m unsure whether this is actually separation anxiety or something else. Please help if anyone has been through this? I had a Golden retriever before and he never destroyed anything 😬.