This could be part of the reason the group have been so quiet on social media. In his post he says he left Chapter 13 months ago.
This is the announcement he made on Instagram:
Hi everyone 🙂 it’s been a while! I just wanted to let you all know that earlier on this year I made the decision to leave Chapter 13. I am so grateful for the opportunities and experiences I have had with the band, but ultimately it became clear that being in the band wasn’t the right thing for me and my mental health which is why things came to an end. I cannot thank you all enough for the support you have given us over the last 4 years, I loved performing for you and meeting as many of you as I did. It’s a big change but I’m really looking forward to what’s next for me as a drummer, whatever that is. Thanks again Noah x