The tool does nothing more in that sense than SSH itself. If you have an unprotected key it doesn't matter if you use it with just core SSH tools, your own scripts to restart things upon connection difficulty, or tools like AutoSSH.

Sometimes unprotected keys are unavoidable for automated admin functions - in this case you have to be careful what access is granted to logins via those keys, and be extra careful to secure the keys themselves including (if you don't generally) having a revocation procedure in place (even if that is as simple as a list of locations the key is accepted to you can remove it from them all) so you can easily deal with one being compromised.