Is Dir1 the user with issues or dummy account or?
I saw Michael's post at Meta and thought I would try to help. I signed up with a gmail address. The Confirmation email arrived in my inbox within a few moments, clicked the link, and was posting this within a minute or two.
Try not using the email hiding stuff with a test account and different email address. Once you see this is not a forum issue the admin could change your addy on the original account, if you ask them nicely. 
From where I site there is no bug if you used the same iCloud+ Hide My Email feature.
No forum admin worth there salt would try to do a forum without email or some ability to verify users.
If you are convinced this forum has a bug try signing up at https://meta.discourse.org/ and see how it works there.
Best of luck.