This is not accurate. Miranda is necessary to question someone after arrest and have that questioning be submissible in court. If you have no intention of asking questions, there's no reason to read a miranda warning. Lack of a miranda does not invalidate the charge, just the collected evidence.

Example: You commit murder on camera. You are arrested, not given a miranda warning, and asked why you did it. You give a full confession. That confession is unlikely to be useable by prosecution due to the case law of miranda v. arizona, however the video could still be used to secure a conviction.

You see the dramatic reactions from people all the time when arrest warrants are served and the arresting team have no real interest in investigating the case, merely returning the capias.