At the very least, Earlier panic was super emo
so i believe that panic at the disco is emo. Nothing will change my opinion. This opinion is also supported by well respected users on social media platforms such as quora and reddit. Panic is very emo. Just let it go.
Early Panic at the disco is pretty emo. When you say "hey, what's an emo song from middle school?" many people will reply with I Write Sins Not Tragedies.
Modern Panic is a lot different. Their music doesn't really have a 2008 emo vibe anymore. So to answer: Yes and also no.