BUG of encrypted DNS percentage statistics on my.nextdns.io page

1. I used DNS-over-QUIC , but why is this encrypted statistics 0%? Is DNS-over-QUIC unencrypted transmission? quic enforces TLS encryption by default. Is it a website bug?
2. If there is no encryption, I don't need DNS-over-QUIC. Although there are currently only this available in mainland China.
3. I have also used DoH3 on Firefox, and it can be used normally in Mainland China. That is, the delay is relatively high, and it is better to use it than nothing.