It’s difficult to say. The decision was made, so regardless action will be taken on your part, which is responsible.
One could argue it’s confirmation bias to so immediately rule out a UTI/bladder stones because it coincides with symptoms you’ve already seen. It happens to everyone though. When Wick is a turd and pees out of his box, my first thought is always teeth, when in reality sometimes he’s just being a jerk. As you know, symptom-ology in rabbits are very overlapping, so assuming to know the diagnoses right off the bat is not the best approach, even if you are correct in your assumption.
It’s easy to see how Asriel’s symptoms match Bombur’s, but those symptoms are also not exclusive to EC obviously, so I can understand the vet tech’s reaction.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.