https://en.wikipedia.org/wiki/Sandbox_(computer_security)
Notably, a sandbox exists to separate one thing from other things. Limiting/filtering/monitoring what the sandboxes thing can do are often components of that, but the underlying premise is about separation.
Containers, VMs, etc. are 100% examples of sandboxing based on the actual industry definition of the term.
You are incorrect.
If you’re going to get fired up about people you feel are misusing this term, and then ignore citations about its actual definition, I think the ball’s in your court to back up your claim.
I’ve asked what background leads to your conclusion, because if you have eg written some sandboxing tooling, I’d be curious to give it a look. Always up to learn things, and I am more than a little baffled by how upset the comments I’m replying to here sound. You’ve linked me to Wikipedia, and another commenter asserts I can ‘just look it up on google scholar’. That seems pretty dismissive and reductive overall.