I just took a look, the relay responds to my nak queries.. It seems to be working. With Nak, you have to make sure you are giving it the right key to use, or it picks a default key and causes much confusion.
The trex is broken for viewing AUTH relays though. I havent had a chance to fix it. I do recommend trying the relay tools APK as it can do AUTH and has better browsing/searching and deletion support. available on obtainium source: apks.relay.tools/apks or zapstore.
Nip86 relay mgmt APIs are also available (what it uses under the hood) if you have a way to use that api for deletes.