An em dash surrounded by spaces on either side tells you it was AI.

AI: This is how we think about these things — because they're important to think about — when we want to accomplish a task.

More likely human: This is how we think about these things—because they're important to think about—when we want to accomplish a task.

Not bulletproof for obvious reasons but it's easy to spot who was at least lazy with AI using this heuristic.