Pretty much. A compketely blank phone is a clear sign that it's wiped, and why would you do that, unless you have sonething to hide, hmm? A phone with a couple of weeks of boring use, maybe a few photos of nice sunsets, a few messages, a take-out ordering app, some boring history in the web browser, and maybe a login to a social media account that follows some celebs and an old school friends or two who don't seem to post any more, just says you got a new phone a while back and you're fairly boring.

Obviously, if they actually have something on you, or they want to pin something on you, those precautions won't actually help much.